9. the set point for normal human body temperature is approximately 37°c. when your body temperature rises above 37°c, you begin to sweat and the evaporation of this perspiration returns the body to its original temperature. which characteristic of living things is this an example of?
10. what is the role of dna in heredity?
11. how do organisms respond to stimuli?
12. viruses are microscopic particles that can infect living cells. they consist of genetic material (dna or rna) surrounded by a protein coat. viruses can reproduce rapidly, but they rely on the host cell’s machinery to do so. they can also evolve over time.
prompt: recall the characteristics shared by all living things. would viruses be considered living organisms? explain your answer, using specific examples from the text to support your reasoning.
13. match each body system with its primary function:
______digestive system
______respiratory system
______circulatory system
______nervous system
______endocrine system
______urinary system
______muscular system
______immune system
______skeletal system
______integumentary system
a. controls and coordinates body functions
b. breaks down food for energy
c. removes waste products from the body
d. provides support and protection
e. transports oxygen and nutrients throughout the body
f. regulates body processes through hormones
g. enables movement, generates heat, and maintains posture
h. exchanges oxygen and carbon dioxide
i. protects the body from injury, aids in thermoregulation
j. protects the body from infection

Question

9. the set point for normal human body temperature is approximately 37°c. when your body temperature rises above 37°c, you begin to sweat and the evaporation of this perspiration returns the body to its original temperature. which characteristic of living things is this an example of?
10. what is the role of dna in heredity?
11. how do organisms respond to stimuli?
12. viruses are microscopic particles that can infect living cells. they consist of genetic material (dna or rna) surrounded by a protein coat. viruses can reproduce rapidly, but they rely on the host cell’s machinery to do so. they can also evolve over time.
    prompt: recall the characteristics shared by all living things. would viruses be considered living organisms? explain your answer, using specific examples from the text to support your reasoning.
13. match each body system with its primary function:
______digestive system
______respiratory system
______circulatory system
______nervous system
______endocrine system
______urinary system
______muscular system
______immune system
______skeletal system
______integumentary system
a. controls and coordinates body functions
b. breaks down food for energy
c. removes waste products from the body
d. provides support and protection
e. transports oxygen and nutrients throughout the body
f. regulates body processes through hormones
g. enables movement, generates heat, and maintains posture
h. exchanges oxygen and carbon dioxide
i. protects the body from injury, aids in thermoregulation
j. protects the body from infection

Accepted Answer

### Question 9
# Answer:
This is an example of **homeostasis** (the characteristic of maintaining a stable internal environment).
# Brief Explanations:
Living things maintain stable internal conditions (homeostasis). When body temperature exceeds 37°C, sweating and evaporation cool the body, returning it to the set - point temperature, showing the body's effort to maintain internal stability.

### Question 10
# Answer:
DNA carries the genetic information (genes) that is passed from parents to offspring. It contains the instructions for the development, functioning, and reproduction of organisms.
# Brief Explanations:
In heredity, DNA acts as the hereditary material. It stores the genetic code in its nucleotide sequence. This code is passed on during reproduction, and it determines the traits of the offspring. For example, DNA in gametes (sperm and egg) combines during fertilization, and the resulting DNA in the zygote contains the genetic blueprint for the new organism.

### Question 11
# Answer:
Organisms respond to stimuli in various ways. For example, plants grow towards light (phototropism), animals may move towards food or away from danger, and the human body sweats when it's hot (a response to a temperature stimulus).
# Brief Explanations:
Stimuli are changes in the environment (internal or external). Organisms have sensory mechanisms to detect stimuli. Then, they respond through physiological or behavioral changes. A plant's phototropic response is due to the differential growth of cells on different sides of the stem in response to light. Animals have nervous and endocrine systems to coordinate responses to stimuli like the presence of a predator (flight or fight response) or the need for food (foraging behavior).

### Question 12
# Answer:
Viruses are not considered living organisms.
# Brief Explanations:
Living things have characteristics like being made of cells, being able to reproduce independently, and maintaining homeostasis. Viruses do not have cells. They rely on host cells to reproduce (they can't reproduce on their own). Also, they don't perform metabolic processes independently. Although they can evolve (as stated in the text), this alone is not enough to be considered living. For example, crystals can grow and evolve in a sense, but they are not living. Viruses need a host cell's machinery to make more viruses, so they lack key characteristics of living organisms.

### Question 13
# Answer:
- Digestive System: B. Breaks down food for energy
- Respiratory System: H. Exchanges oxygen and carbon dioxide
- Circulatory System: E. Transports oxygen and nutrients throughout the body
- Nervous System: A. Controls and coordinates body functions
- Endocrine System: F. Regulates body processes through hormones
- Urinary System: C. Removes waste products from the body
- Muscular System: G. Enables movement, generates heat, and maintains posture
- Immune System: J. Protects the body from infection
- Skeletal System: D. Provides support and protection
- Integumentary System: I. Protects the body from injury, aids in thermoregulation
# Brief Explanations:
- Digestive System: Its main job is to break down food into nutrients that can be used for energy and other processes.
- Respiratory System: It is responsible for gas exchange, taking in oxygen and releasing carbon dioxide.
- Circulatory System: It uses blood to transport oxygen, nutrients, and other substances to cells and removes waste from cells.
- Nervous System: It uses neurons to send signals that control and coordinate all body functions, from movement to thought.
- Endocrine System: It secretes hormones into the bloodstream, and these hormones regulate long - term processes like growth, metabolism, and reproduction.
- Urinary System: It filters the blood, removes waste products (like urea) and excess water, and excretes them as urine.
- Muscular System: Muscles contract and relax to enable movement, and muscle contraction also generates heat and helps maintain posture.
- Immune System: It has cells (like white blood cells) and proteins that identify and destroy pathogens (like bacteria and viruses) to protect the body from infection.
- Skeletal System: Bones provide a framework for the body (support) and protect internal organs (like the skull protecting the brain).
- Integumentary System: The skin (the main organ of this system) protects the body from physical injury, helps regulate body temperature (through sweating and blood vessel dilation/constriction), and prevents water loss.

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