Answer:
a. concentration gradient
Explanation:
i did it in apex and got it right.
Answer:
cells and structure
Explanation:
the place where they live cannot be a basis of classification
Answer:
The small number behind each element symbol designates the number of atoms of each element in a chemical formula. If there is no number, it is assumed there is only one of those elements. A large number in front of a compound designates how many units there are of that compound.
They do this real fancy thing called breathing. There's a couple other organisms that do this too, but none compare to the frog
