l1. list the 5 characteristicsof life.l1. define organism.l1 define cell.l2. contrast unicellularorganisms andmulticellular organisms.l2. all energy comes fromthe sun, but explain how it istransferred from oneorganism to another.l1. define stimuli.(extra: list 2 internal stimuli)l2. contrast internal andexternal stimuli.l1. define homeostasisl3. predict what wordexplains why you go to thebathroom more when youdrink a lot of water?l2. explain why maintaining

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### 1. L1. List the 5 characteristics of life.
# Brief Explanations:
The five characteristics of life are: 1. Made of cells (all living things are composed of one or more cells). 2. Obtain and use energy (organisms need energy for growth, reproduction, etc., e.g., plants photosynthesize, animals consume food). 3. Reproduce (either sexually or asexually to pass on genetic material). 4. Respond to stimuli (react to internal or external changes, like a plant growing toward light). 5. Grow and develop (increase in size, complexity, or undergo changes in life stages, e.g., a tadpole becoming a frog).
# Answer:
1. Made of cells
2. Obtain and use energy
3. Reproduce
4. Respond to stimuli
5. Grow and develop

### 2. L1. Define organism.
# Brief Explanations:
An organism is a living entity that can carry out all the basic life processes (like growth, reproduction, response to stimuli, etc.). It can be unicellular (e.g., bacteria) or multicellular (e.g., humans, plants) and is capable of independent existence (or as part of a colony in some cases) while performing life - sustaining functions.
# Answer:
An organism is a living entity (unicellular or multicellular) that can carry out all essential life processes (e.g., growth, reproduction, response to stimuli, obtaining energy) and exists independently (or as part of a colony in some cases).

### 3. L1. Define cell.
# Brief Explanations:
A cell is the basic structural and functional unit of all living organisms. It is the smallest unit that can perform all the activities associated with life. Cells can be prokaryotic (lack a nucleus, e.g., bacteria) or eukaryotic (have a nucleus and membrane - bound organelles, e.g., animal and plant cells). Some organisms are unicellular (composed of one cell), and others are multicellular (composed of many cells).
# Answer:
A cell is the basic structural and functional unit of life, the smallest unit capable of performing all life - sustaining activities. Cells can be prokaryotic (no nucleus) or eukaryotic (with a nucleus and organelles), and organisms can be unicellular (one cell) or multicellular (many cells).

### 4. L2. Contrast unicellular organisms and multicellular organisms.
# Brief Explanations:
- **Unicellular organisms**: Composed of a single cell. This single cell carries out all life processes (e.g., bacteria, amoeba). They are usually simpler in structure and function compared to multicellular organisms. Their size is generally very small (microscopic in most cases).
- **Multicellular organisms**: Composed of many cells. Cells are specialized to perform different functions (e.g., muscle cells for movement, nerve cells for communication in animals; root cells for absorption, leaf cells for photosynthesis in plants). They are generally larger in size and more complex in structure and function. Cells work together in a coordinated manner to support the life of the organism.
# Answer:
- Unicellular: 1 cell, single cell does all life processes, simple structure/function, small (often microscopic).
- Multicellular: Many cells, cells specialized for functions, complex structure/function, larger, cells work in coordination.

### 5. L2. All energy comes from the sun, but explain how it is transferred from one organism to another.
# Brief Explanations:
Plants (producers) capture solar energy through photosynthesis and convert it into chemical energy stored in glucose (or other organic molecules). Herbivores (primary consumers) eat plants, and the energy stored in the plant's organic matter is transferred to the herbivore. Then, carnivores (secondary/tertiary consumers) eat the herbivores, and the energy is further transferred. Decomposers break down dead organisms and waste, releasing some energy back into the ecosystem (but most energy is lost as heat at each trophic level).
# Answer:
1. Producers (e.g., plants) use photosynthesis to convert solar energy into chemical energy (stored in organic molecules like glucose).
2. Primary consumers (e.g., herbivores) eat producers, transferring the stored chemical energy to themselves.
3. Secondary/tertiary consumers (e.g., carnivores) eat primary consumers, transferring energy again.
4. Decomposers break down dead organisms/waste, releasing some energy (most energy is lost as heat at each trophic level).

### 6. L1. Define stimuli (Extra: List 2 internal stimuli).
# Brief Explanations:
Stimuli are changes in the internal or external environment that cause an organism to respond. Internal stimuli are changes within the organism's body. Examples of internal stimuli: 1. Hunger (caused by low blood sugar levels, prompting the organism to seek food). 2. Thirst (caused by low water levels in the body, prompting the organism to seek water).
# Answer:
- Definition: Stimuli are internal or external environmental changes that elicit an organism's response.
- Internal stimuli examples: 1. Hunger (due to low blood sugar). 2. Thirst (due to low body water levels).

### 7. L2. Contrast internal and external stimuli.
# Brief Explanations:
- **Internal stimuli**: Originate within the organism's body. They are related to the internal physiological state of the organism, such as changes in hormone levels, blood sugar levels, or body temperature. For example, a decrease in blood sugar causes hunger (an internal stimulus).
- **External stimuli**: Originate from the organism's external environment. They include factors like light, temperature, sound, touch, or the presence of other organisms. For example, a sudden loud noise (external stimulus) can make an animal jump, or a plant growing towards light (response to external light stimulus).
# Answer:
- Internal stimuli: Originate within the organism (e.g., low blood sugar, hormone changes).
- External stimuli: Originate from the external environment (e.g., light, temperature, sound).

### 8. L1. Define homeostasis.
# Brief Explanations:
Homeostasis is the ability of an organism (or a cell) to maintain a stable internal environment despite changes in the external environment. This involves regulating factors like body temperature (in animals), blood pH, blood glucose levels, and water balance. For example, humans maintain a body temperature of around 37°C, and if it deviates, mechanisms like sweating (to cool down) or shivering (to warm up) are activated to bring it back to the normal range.
# Answer:
Homeostasis is an organism's (or cell's) ability to maintain a stable internal environment (e.g., temperature, pH, glucose levels) despite external environmental changes.

### 9. L3. Predict what word explains why you go to the bathroom more when you drink a lot of water?
# Brief Explanations:
When you drink a lot of water, the body's water content increases. To maintain homeostasis (specifically, osmoregulation - the regulation of water and solute balance), the kidneys filter out the excess water, leading to an increase in urine production. So the word is "homeostasis" (more specifically, osmoregulation which is a part of homeostasis). The body is trying to maintain a stable internal water balance, so it excretes the excess water as urine.
# Answer:
Homeostasis (specifically osmoregulation, a part of homeostasis) explains this, as the body excretes excess water to maintain internal water - solute balance.

### 10. L2. Explain why maintaining (Note: The question seems incomplete, but assuming it's about maintaining homeostasis)
# Brief Explanations:
Assuming the question is about maintaining homeostasis, organisms need to maintain homeostasis because the biochemical reactions that sustain life (e.g., enzyme - catalyzed reactions) occur within a narrow range of conditions (like specific temperature, pH, and concentration of substances). If homeostasis is not maintained, these reactions can be disrupted, leading to malfunction of cells, tissues, organs, and ultimately the whole organism. For example, if body temperature gets too high, enzymes can denature (lose their specific 3 - D structure and function), which can be life - threatening.
# Answer:
(Assuming the question is about maintaining homeostasis) Organisms maintain homeostasis to ensure that biochemical reactions (e.g., enzyme - catalyzed reactions) essential for life occur within a narrow, optimal range of conditions (e.g., temperature, pH), as disruptions can cause cellular/organismal malfunction or death.

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Explanation:

1. L1. List the 5 characteristics of life.

Answer:

2. L1. Define organism.