A fertilized egg is called a zygote until it divides into 16 cells, forming a ball-shaped structure called a morula. ... In humans, it takes about four days for a zygote to become a morula and another three days until the embryo attaches itself to the mother's uterine wall.
I think the answer to this question would be letter A. Amphibians
B. Eating a variety of healthy food.
It's not A because the body needs more than just protein. It can't be C because even though juice might have vitamins (and a LOT of sugar), it might not have pulp from the fruit that it is made out of. Pulp gives you fiber. It cannot be D because even if you don't eat anything fatty, some fats are actually necessary for your body. It's got to be B.
Your immune system fights of disease
Answer:
D. sodium, nitrogen, oxygen
Explanation:
Let's break up NaNO3 into its separate chemical symbols:
Na, N, O
Na is the symbol for sodium
N is the symbol for nitrogen
O is the symbol oxygen
