Why is the ventricle of a frogs heart thicker and more muscular than the atria in the heart?

The first signs of cellular differentiation occur in the blastocyst. why is cellular differentiation important for the development of a fully formed human infant?

Dna replication or repair occurs in a cell in all of thw following situations except when

How are fungi more like an animal? they have a cell wall. they are heterotrophs that absorb their food. they produce seeds and have membrane-bound nucleus. they use sunlight for photosynthesis.