Explain why plants have ways of avoiding self-pollination

An atom of nitrogen had seven protons in its nucleus. how many electrons does it have

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.

Apart of an ecosystem that can restrict the growth of a population is referred to as