Answer:
B. When there are limited resources
Answer:
<em>Controlled variables</em>
Explanation:
In a controlled experiment, the control group and the experimental groups are the same except for a factor in the experimental groups called a. variable parameter. In a controlled experiment, the factors that are kept the same between groups are called. controlled parameters.
If I'm right I'd say They control and direct the quantity of food passing through the digestive organs and prevent backward movement of partially digested food. Hope it's helpful.
Answer:
they are all lined up.
Explanation:
the moon blocks the sun which is in front of the earth
