7.) Embryology provides evidence of evolution because The absence of fossilized embryos shows that this is a recent development.
The DNA of embryos of different species is very similar.
All animal species have the same number of chromosomes.
There is great physical similarity among the early stages of embryos of very different species.

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

i believe the answer is snake.