11. which activity is an example of the human body striving to maintain the characteristic of living organisms know as homeostasis? (a.4.a)
a. creating thoughts to solve a difficult problem
b. digesting foods to reduce their particle size
c. producing sweat to reduce body temperature
d. sprinting across a street to avoid oncoming traffic
12. the difference between growth and development is: (a.4.a)
a. growth happens only in unicellular organisms and development happens in both unicellular and multicellular organisms.
b. growth involves an increase in mass or size and development involves changes in an organism.
c. growth involves changes in an organism and development is an increase in mass or size.
d. growth is a characteristic of living things but development is not.
13. all of the following are characteristics shared by all living organisms except: (a.4.a)
a. ability to move
b. composed of cells with genetic material such as dna
c. ability to reproduce
d. ability to adapt to changing environments
14. gavin measured the length of each of 5 oyster shells and recorded the data in this table.
| oyster shell | shell length (cm) |
| ---- | ---- |
| 1 | 4.0 |
| 2 | 5.8 |
| 3 | 5.2 |
| 4 | 4.0 |
| 5 | 6.9 |
what is the mean shell length for these 5 oyster shells? (a.2.c)
a. 4.0 cm
b. 5.0 cm
c. 5.2 cm
d. 6.9 cm
15. ebola is a potentially deadly virus in the blood which causes ebola fever. ebola virus is often spread by monkeys. scientists used 2 groups of monkey kidney cells in an experiment to confirm the first human case of ebola fever. the scientists inoculated cells in group 1 with samples of the ebola virus taken from a human with ebola fever. they did not inoculate the cells in group 2. (a.1.b, a.4.c)
what was the control group in the experiment?
a. all of the monkey kidney cells
b. monkey kidney cells in group 1
c. monkey kidney cells in group 2
d. the ebola virus

Question

Accepted Answer

### 11.
# Brief Explanations:
Homeostasis is the body's ability to maintain a stable internal environment. Sweating helps reduce body temperature when it's too high, which is an example of homeostasis.
# Answer:
C. producing sweat to reduce body temperature

### 12.
# Brief Explanations:
Growth refers to an increase in mass or size, while development involves more complex changes in an organism's structure and function.
# Answer:
B. Growth involves an increase in mass or size and development involves changes in an organism.

### 13.
# Brief Explanations:
Not all living organisms can move (e.g., plants). But all are composed of cells with DNA, can reproduce, and adapt to the environment.
# Answer:
A. Ability to move

### 14.
# Explanation:
## Step1: Recall mean formula
The mean $\bar{x}=\frac{\sum_{i = 1}^{n}x_{i}}{n}$, where $x_{i}$ are the data - points and $n$ is the number of data - points. Here, $n = 5$, $x_1=4.0$, $x_2 = 5.8$, $x_3=5.2$, $x_4 = 4.0$, $x_5=6.9$.
## Step2: Calculate the sum
$\sum_{i = 1}^{5}x_{i}=4.0 + 5.8+5.2+4.0+6.9=25.9$.
## Step3: Calculate the mean
$\bar{x}=\frac{25.9}{5}=5.18\approx5.2$.
# Answer:
C. 5.2 cm

### 15.
# Brief Explanations:
In an experiment, the control group is the group that does not receive the treatment (inoculation with the Ebola virus in this case). Group 2 did not receive the virus.
# Answer:
C. Monkey kidney cells in Group 2

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11.

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12.