They produce hydrogen gas when reacted with metals
Answer:
C: autocrine
Explanation:
There are three types of hormones according to where their target cells are.
- Endocrine: Their target cells are distributed far and they travel via blood to reach the target cells.
- Paracrine: Their target cells are often their neighbors so they often diffuse to reach them
- Autocrine: Their secretion acts on themselves. Hence they are their own targets.
B!! Because it talks more about the question
Answer:
as people use more and more fossil fuels for their purposes they are not distributed evenly
The answer is <span>Take consistent amounts of saliva samples from a number of people who have not eaten in 8 hours and measure the quantity of amylase in each sample.
First, the researcher needs to know the quantity of amylase in the <u>same</u> amount of saliva. Thus the amount must be consistent and not varying.
Next, people must not eat in 8 hours, so they are all in the same condition at the moment of collecting saliva. If some eat immediately before the sample collecting while some eat 8 hours before, the content of their saliva will be different.
For the correct results, all conditions must be the same.</span>
