Why does a vestigial pelvis show that the ancestors of the modern whale once had legs?

What is the broadest level of classification of life

The energy available as a result of the motion of a body is called energy. -potential -gravitational -kinetic -chemical

Which organelles are labeled d, and what is one feature that distinguishes them from the other labeled organelles chloroplasts the only organelles that produce sugars from sunlight mosomes, only found in animal and bacterial cells centricles only found in animal cells mitochondra, the only energo-generating structures found in cells