Q2 please answer me thank you so much

Which pattern most likely came from a gunshot and which one was produced from a blow on the head? explain your answer?

What kind of seafood would you expect to have the highest levels of mercury and why? kelp, because they use the sun to photosynthesize on the bottom trophic level. oysters, because they filter feed on plankton on a lower trophic level. small fish, because they eat plankton on a higher trophic level. sharks, because they feed on organisms on a higher trophic level.

Which is the correct formula for photosynthesis