B. One
because an independent variable is something you change. So in a scientific experiment you only change one thing. If you happen to change more than one thing then the test becomes unfair therefore you should repeat and make sure that only one thing is changed this time.
Answer:
Both whales and hippos have almost no hair on their bodies. They do not have sweat glands.
Explanation:
Answer:
second one
Explanation:
the second one is aerobic respiration which creates alot of energy
A volatile acid can leave the solution and enter the atmosphere
2 with D and 1 with E and
