4. what environmental issue was targeted in rachel carson’s book, silent spring? what was the outcome of her efforts?

concept 52.2 interactions between organisms and the environment limit the distribution of species

5. what is biogeography? what factors determine the distribution of organisms?

6. read this section carefully to understand different types of experiments and observations that help explain the distribution of species. as you conclude this section, list and describe five examples of biotic factors.

| biotic factor | example and description |
|---------------|-------------------------|
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7. list five abiotic factors. include an example and description of each factor’s influence on living organisms.

| abiotic factor | example and description |
|----------------|-------------------------|
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Question

4. what environmental issue was targeted in rachel carson’s book, silent spring? what was the outcome of her efforts?

concept 52.2 interactions between organisms and the environment limit the distribution of species

5. what is biogeography? what factors determine the distribution of organisms?

6. read this section carefully to understand different types of experiments and observations that help explain the distribution of species. as you conclude this section, list and describe five examples of biotic factors.

| biotic factor | example and description |
|---------------|-------------------------|
|               |                         |
|               |                         |
|               |                         |
|               |                         |
|               |                         |

7. list five abiotic factors. include an example and description of each factor’s influence on living organisms.

| abiotic factor | example and description |
|----------------|-------------------------|
|                |                         |
|                |                         |
|                |                         |
|                |                         |
|                |                         |

Accepted Answer

### Question 4
# Brief Explanations:
Rachel Carson's "Silent Spring" targeted the environmental issue of the harmful effects of synthetic pesticides, particularly DDT, on the environment, wildlife (like birds), and human health. The outcome of her efforts was increased public awareness about environmental pollution, the initiation of the modern environmental movement, and eventually, the ban of DDT in the United States (and many other countries) and the establishment of the Environmental Protection Agency (EPA).
# Answer:
- Environmental issue: Harmful effects of synthetic pesticides (especially DDT) on the environment, wildlife, and human health.
- Outcome: Increased environmental awareness, start of the modern environmental movement, ban of DDT in the US, and creation of the EPA.

### Question 5
# Brief Explanations:
Biogeography is the study of the geographic distribution of species (both past and present) and the factors that influence this distribution. The factors determining the distribution of organisms include both biotic factors (interactions with other living organisms like predation, competition, symbiosis) and abiotic factors (non - living components like temperature, water availability, soil type, sunlight, and wind).
# Answer:
- Biogeography: The study of the geographic distribution of species (past and present) and the factors influencing it.
- Determining factors: Biotic factors (e.g., predation, competition, symbiosis) and abiotic factors (e.g., temperature, water, soil, sunlight, wind).

### Question 6
| Biotic Factor | Example and Description |
| ---- | ---- |
| Predation | Example: Lions preying on zebras in African savannas. Description: Predation affects the population size and distribution of prey species (zebras) as they need to avoid areas with high lion density, and also influences the predator species (lions) distribution based on prey availability. |
| Competition | Example: Two species of birds competing for the same type of nesting sites in a forest. Description: Competition for limited resources (nesting sites) can limit the distribution of each bird species, as one species may out - compete the other in certain areas, forcing the less competitive species to find alternative habitats. |
| Symbiosis (Mutualism) | Example: Bees and flowering plants. Description: Bees get nectar from flowers (a food source), and in return, they help in pollinating the plants, which is essential for the plants' reproduction. This mutualistic relationship influences the distribution of both bees (they are attracted to areas with a high density of flowering plants) and the plants (they depend on bees for pollination, so areas with bee populations are favorable for their reproduction and distribution). |
| Symbiosis (Parasitism) | Example: Tapeworms in the intestines of humans. Description: The tapeworm (parasite) benefits by getting nutrients from the human host, while the human (host) is harmed. The presence of tapeworms can affect the health and distribution of the human population (people may avoid areas with poor sanitation where tapeworm - infected food or water is common), and the tapeworm's distribution is limited to areas with suitable hosts (humans with poor hygiene and sanitation conditions). |
| Herbivory | Example: Deer grazing on grass in a meadow. Description: Herbivory by deer affects the distribution of grass (as deer will graze more in areas with abundant grass, potentially reducing grass density in those areas) and also the distribution of deer (they are attracted to areas with high grass availability for food). |

### Question 7
| Abiotic Factor | Example and Description |
| ---- | ---- |
| Temperature | Example: Polar bears in the Arctic. Description: Polar bears are adapted to cold temperatures. The low temperature in the Arctic (along with ice cover) is essential for their survival as it provides the environment for their prey (seals) and their hunting behavior. Areas with warmer temperatures (like tropical regions) are not suitable for polar bears, limiting their distribution to the Arctic. |
| Water Availability | Example: Cacti in deserts. Description: Deserts have limited water availability. Cacti are adapted to survive in arid conditions with specialized structures (like thick stems to store water) to conserve water. Their distribution is limited to desert areas where water is scarce, as they cannot survive in areas with high water availability (like rainforests) due to the risk of root rot and other problems associated with excessive moisture. |
| Soil Type | Example: Blueberries growing in acidic soil. Description: Blueberries require acidic soil (pH around 4.5 - 5.5) to grow properly. Their distribution is limited to areas with acidic soil, such as certain parts of North America with pine - forest - derived acidic soils. In areas with alkaline soil, blueberries will not grow well, so their distribution is restricted by soil type. |
| Sunlight | Example: Shade - loving plants like ferns in a forest understory. Description: Ferns are adapted to low - light conditions in the forest understory. They cannot tolerate high levels of direct sunlight, so their distribution is limited to the shaded areas under the forest canopy. In open, sunny areas, ferns will not grow as they will be damaged by excessive sunlight and heat. |
| Wind | Example: Wind - dispersed seeds (e.g., dandelions). Description: Dandelion seeds have a feathery structure that allows them to be carried by the wind. Wind helps in the dispersal of dandelion seeds, which in turn influences the distribution of dandelion plants. Areas with stronger wind currents can have a wider distribution of dandelions as the seeds are carried further, while in areas with little wind, dandelion distribution may be more limited. |

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