What do we call mitochondria in cells

How energy flows through each level in this energy pyramid. is all the matter and energy from one level transferred to the next level?

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.

Which type of neuron stimulates muscles to contract?