What does it mean when we say dna replication is semiconservative

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.

About how many years does it take for one cycle of surface water to become deep water and then surface water again in the oceans? 101001,000

Which number represents a basic ph, 4 or 9? numerical answers expected! answer for blank 1: i'll give