Why do higher trophic levels in most ecosystems contain fewer organisms than lower trophic
levels?
A. Energy available for use to the highest trophic
level is small
B. Energy available for use to the lowest trophic
level is small.
C. Energy available for use to the highest trophic
level is large.
D. Energy available for use to the highest and
lowest trophic levels is the same.

A.Energy available for use to the highest trophic  level is small

Explanation:

As you go up in the trophic levels, only about 10% of the energy gets transferred from one level to the next. For example, the plants can only harvest 1% of the Sun's energy. The primary consumer can only absorb 10% of the energy from the plant he eats, so .1% of the total energy. The secondary consumer can only absorb 10% of the energy he get from eating the primary consumer, so .01%, and so on and so forth. As we climb up the trophic levels, there is less energy available and therefore less organisms.

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.