darwins voyage
guide for reading
- how did darwin explain the differences between species on the galapagos islands and on mainland south america?
- how does natural selection lead to evolution?
- how do new species form?

in 1831, charles darwin left england on board the hms beagle. on the ships voyage, darwin was amazed by the tremendous diversity, or variety, of living things he saw. today, scientists have identified more than 2.5 million species of organisms. a species is a group of similar organisms that can mate with each other and produce fertile offspring. in 1835, the beagle reached the galapagos islands in the pacific ocean.
darwin was surprised that many of the plants and animals on the galapagos islands were similar to organisms on mainland south america. however, there were also important differences. darwin inferred that a small number of different species had come to the islands from the mainland. the eventually, their offspring became different from the mainland relatives. the finches on the galapagos islands were noticeably different from one island to another. the most obvious differences were the varied sizes and shapes of the birds beaks. beak shape is an example of an adaptation, a trait that helps an organism survive and reproduce. darwin reasoned that plants and animals on the islands faced conditions that were different from those on the mainland. perhaps, darwin thought, the species gradually changed over many generations and became better adapted to the new conditions. the gradual change in a species over time is called evolution. darwins ideas are often referred to as the theory of evolution. a scientific theory is a well - tested concept that explains a wide range of observations.
in his book the origin of species, darwin explained that evolution occurs by means of natural selection. natural selection is the process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species. a number of factors affect the process of natural selection: overproduction, competition, and variations. any difference between individuals of the same species is called a variation. some variations make certain individuals better adapted to their environment because of helpful traits they possess. over a long period of time, natural selection can lead to evolution. helpful variations gradually accumulate in a species, while unfavorable ones disappear. without variations, all members of a species would have the same traits. only traits that are inherited, or controlled by genes, can be acted upon by natural selection.
isolation, or complete separation, occurs when some members of a species become cut off from the rest of the species. a new species can form when a group of individuals remains separated from the rest of its species long enough to evolve different traits. geographic isolation has occurred in the past because of continental drift.

1. who was charles darwin, and what did he do on the beagles voyage?
2. what is evolution?
3. explain how the shape of the finchs beak is an example of an adaptation?
4. when members of a species compete, what do they compete for?
5. what happens when species overproduce offspring?
6. suppose a variation makes an individual member of a species better adapted to its environment, how might that variation affect the individuals reproduction?
7. how does the environment \select\ organisms?
8. how do helpful variations accumulate in a species over time?
9. why can only traits controlled by genes be acted upon by natural selection?
10. how can isolation of a group result in a new species?

Question

darwins voyage
guide for reading
- how did darwin explain the differences between species on the galapagos islands and on mainland south america?
- how does natural selection lead to evolution?
- how do new species form?

in 1831, charles darwin left england on board the hms beagle. on the ships voyage, darwin was amazed by the tremendous diversity, or variety, of living things he saw. today, scientists have identified more than 2.5 million species of organisms. a species is a group of similar organisms that can mate with each other and produce fertile offspring. in 1835, the beagle reached the galapagos islands in the pacific ocean.
darwin was surprised that many of the plants and animals on the galapagos islands were similar to organisms on mainland south america. however, there were also important differences. darwin inferred that a small number of different species had come to the islands from the mainland. the eventually, their offspring became different from the mainland relatives. the finches on the galapagos islands were noticeably different from one island to another. the most obvious differences were the varied sizes and shapes of the birds beaks. beak shape is an example of an adaptation, a trait that helps an organism survive and reproduce. darwin reasoned that plants and animals on the islands faced conditions that were different from those on the mainland. perhaps, darwin thought, the species gradually changed over many generations and became better adapted to the new conditions. the gradual change in a species over time is called evolution. darwins ideas are often referred to as the theory of evolution. a scientific theory is a well - tested concept that explains a wide range of observations.
in his book the origin of species, darwin explained that evolution occurs by means of natural selection. natural selection is the process by which individuals that are better adapted to their environment are more likely to survive and reproduce than other members of the same species. a number of factors affect the process of natural selection: overproduction, competition, and variations. any difference between individuals of the same species is called a variation. some variations make certain individuals better adapted to their environment because of helpful traits they possess. over a long period of time, natural selection can lead to evolution. helpful variations gradually accumulate in a species, while unfavorable ones disappear. without variations, all members of a species would have the same traits. only traits that are inherited, or controlled by genes, can be acted upon by natural selection.
isolation, or complete separation, occurs when some members of a species become cut off from the rest of the species. a new species can form when a group of individuals remains separated from the rest of its species long enough to evolve different traits. geographic isolation has occurred in the past because of continental drift.

1. who was charles darwin, and what did he do on the beagles voyage?
2. what is evolution?
3. explain how the shape of the finchs beak is an example of an adaptation?
4. when members of a species compete, what do they compete for?
5. what happens when species overproduce offspring?
6. suppose a variation makes an individual member of a species better adapted to its environment, how might that variation affect the individuals reproduction?
7. how does the environment \select\ organisms?
8. how do helpful variations accumulate in a species over time?
9. why can only traits controlled by genes be acted upon by natural selection?
10. how can isolation of a group result in a new species?

Accepted Answer

, embarked on the HMS *Beagle*’s voyage. During the voyage, he observed the diversity of living things, including similarities and differences between organisms on the Galapagos Islands and mainland South America.

### 2. What is evolution?
# Brief Explanations:
The article defines evolution as the gradual change in a species over time. Darwin proposed this as part of his theory, explaining how species adapt to their environments across generations.
# Answer: Evolution is the gradual change in a species over time.

### 3. Explain how the shape of the finch’s beak is an example of an adaptation?
# Brief Explanations:
An adaptation is a trait that helps an organism survive and reproduce. The finch’s beak shape is an adaptation because it allows the finch to access food (e.g., different beak shapes for different diets like seeds or insects) in its environment, improving its ability to survive and reproduce.
# Answer: The finch’s beak shape is an adaptation because it is a trait that helps the finch survive and reproduce (e.g., by allowing it to access specific food sources in its environment).

### 4. When members of a species compete, what do they compete for?
# Brief Explanations:
The article states that natural selection involves overproduction, competition, and variations. Members of a species compete for resources like food, water, shelter, and mates (since these are necessary for survival and reproduction).
# Answer: Members of a species compete for resources such as food, water, shelter, and mates (resources needed for survival and reproduction).

### 5. What happens when species overproduce offspring?
# Brief Explanations:
Overproduction is a factor in natural selection. When a species overproduces offspring, there are more offspring than the environment can support. This leads to competition among the offspring for limited resources, and only some will survive and reproduce.
# Answer: When a species overproduces offspring, there are more offspring than the environment can support, leading to competition for resources (food, shelter, etc.), and only some offspring will survive and reproduce.

### 6. Suppose a variation makes an individual member of a species better adapted to its environment, how might that variation affect the individual’s reproduction?
# Brief Explanations:
Natural selection favors individuals with helpful variations. A better-adapted individual is more likely to survive and reproduce (since it can better access resources and avoid threats). Thus, the variation increases the individual’s chance to reproduce, passing the helpful trait to offspring.
# Answer: The variation (helpful adaptation) makes the individual more likely to survive and reproduce, as it is better suited to the environment (e.g., better access to food, avoiding predators). This increases the individual’s reproductive success (more likely to pass the trait to offspring).

### 7. How does the environment “select” organisms?
# Brief Explanations:
The environment “selects” organisms through natural selection: individuals with traits (variations) better adapted to the environment are more likely to survive and reproduce. The environment’s conditions (e.g., food availability, climate, predators) determine which traits are favorable, so organisms with those traits are “selected” to pass on their genes.
# Answer: The environment “selects” organisms through natural selection: individuals with traits (variations) better adapted to the environment are more likely to survive and reproduce. The environment’s conditions (e.g., food, climate, predators) determine which traits are favorable, so organisms with those traits are more likely to pass on their genes.

### 8. How do helpful variations accumulate in a species over time?
# Brief Explanations:
Over time, natural selection acts on helpful variations. Individuals with helpful variations survive and reproduce more, passing the variation to their offspring. Gradually, across generations, the helpful variation becomes more common (accumulates) in the species as unfavorable variations disappear.
# Answer: Helpful variations accumulate over time because individuals with these variations are more likely to survive and reproduce, passing the variation to their offspring. Over many generations, the helpful trait becomes more common in the species.

### 9. Why can only traits controlled by genes be acted upon by natural selection?
# Brief Explanations:
The article states that only inherited (gene - controlled) traits can be acted upon by natural selection. Traits not controlled by genes (e.g., acquired traits) cannot be passed to offspring. Natural selection requires traits to be heritable (passed through genes) to influence future generations.
# Answer: Only traits controlled by genes can be acted upon by natural selection because only these traits are inherited (passed from parents to offspring). Traits not controlled by genes (acquired traits) cannot be passed to offspring, so natural selection cannot act on them.

### 10. How can isolation of a group result in a new species?
# Brief Explanations:
Isolation (e.g., geographic isolation) occurs when a group is cut off from the rest of its species. Over time, the isolated group evolves different traits due to natural selection in its unique environment. If the group remains isolated long enough, these differences become so significant that they can no longer mate with the original species to produce fertile offspring, forming a new species.
# Answer: When a group is isolated from the rest of its species, it experiences unique environmental conditions. Over time, natural selection causes the isolated group to evolve different traits. If the isolation lasts long enough, the group’s traits become distinct enough that it can no longer interbreed with the original species to produce fertile offspring, resulting in a new species.

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Question

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2. What is evolution?

Answer:

3. Explain how the shape of the finch’s beak is an example of an adaptation?