1. Biotic factors like wolves can have an effect on abiotic factors like rivers.
True or False

2. Energy can not be transferred from one trophic level to the next.
True or False

3. Extirpation is when a species disappears from a part of its range.
True or false

1. True

Biotic factors can have effect on abiotic factors like water by the way they use it and how much they drink. If biotic factors drink too much water in a rivver then it could end up with limited amount of water for the ecosystem.

2. False

On average, about 50 percent of energy available within one trophic level is transferred to the next trophic level.

3. True

Extirpation is extinction of a species in a given area.

the correct answer is 4) heat and pressure

metamorphic rocks arise from transformation of existing rocks types, in a process called metamorphism. during metamorphism the original rock(prolith) change into metamorphic rock by heating (150-200c) and pressure of more than 1000 bar. the original rock can be sedimentary, igneous, or existing metamorphic rock.

i believe your answer would be c.. : )