Which of these are symptoms of cardiac chest pain

What types of energy transfers and energy transportations are involved in the domino chain reaction?

Ascientific idea becomes valid when it is what?

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.