Which of the following statements correctly describes the full value of a keystone species on its ecological community?

A. They are non-native organisms that can damage the ecosystem, so removing them increases biodiversity.

B. They are the largest species in a community and consume more than the others, keeping other populations in check.

C. They are superior predators that displace inferior competitors.

D. They have a disproportionate effect relative to their frequency in the population, so the ecosystem often collapses when they are removed.

c

explanation:

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.

passive transport is a movement of biochemicals and other atomic or molecular substances across cell membranes without need of energy input. unlike active transport, it does not require an input of cellular energy because it is instead driven by the tendency of the system to grow in entropy.

so, according to what that says, i believe it's hypertonic and hypotonic.

good luck!