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

i'd say that the moon rock is about 2.2 billion years old.

videntify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.