Answer:
Signposts that determine the fate of cells.
Explanation:
Embryos for humans and other animals often look alike at certain developmental stages because they share ancient genes. This expression means that a more advanced organism, like humans, will resemble less advanced species during it's development stages.
Answer:
it is the thymus
Explanation:
this is where the t cells and b cells are made
Both will contain the sugar ribose and the base uracil
The answer is c, because a compound is two substances combined chemically and a mixture is not
