Answer:
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.
Answer:
C. Stabilizing selection
Explanation:
Natural selection, is of three different types namely: disruptive selection, directional selection and stabilizing selection. Disruptive selection occurs when the two extremes of a population are being favored over the average or intermediate.
Directional occurs when one extreme of a population is favored. However, in STABILIZING SELECTION, the average or intermediate population is favored over both extremes of a population. Example is when the average-sized beaks of a bird population is being favored over the long and short ones (extremes).
