Why does a cell go through cell division?

Efficiency is the percent of work put into a machine by the user (input work) that becomes work done by the machine (output work)

In what part of the body does the most muscle activity happen?

The embryos of a bird, a reptile, and a mammal are similar in appearance. how does comparing the physical appearance of embryos of different species support the theory of evolution? a. it shows that these organisms share a common ancestor. b. it provides evidence that these organisms eat the same foods.c. it shows that these organisms share the same habitat.d. it provides evidence that these organisms suffered a genetic mutation.