Answer:
Oxygen and carbon dioxide!
Explanation:
Oxygen and carbon dioxide are uncharged small molecules that can freely pass through a biological membrane. :)
Hello :), nitrogen have 7 protons and 7 electrons.
I'm thinking the brain. The brain produces hormones and chemicals that tell the body to grow. And you also need to think a lot when trying to survive, which is when the brain comes in handy.
B becuase wait for the first one day and then i’m the park to go go ahead to get it out and i’m and then i’m and i will
The answer is: Difficult to control all variables except one being tested
