What happens when the cell empties itself of water

Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

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.