Explain why a thermocline exists in both temperate and tropical ocean but not in polar oceans

About how much of the cell mass is watet

Which of these parts of the membrane large moecules pass through it ?

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.