Constipation is a condition where the feces become hard and difficult to pass. what are two possible reasons for this condition?

What would happen if the krill were removed from the food web

Does all the energy stored by the phytoplankton reach the top level of the pyramid

Abotanist working in the amazon rain forest discovers a new species of orchid. interestingly, males but not females of a certain wasp species keep visiting the flowers of these orchids. why?