Apyramid of energy has 100 units of energy available for the first traffic level. how many units would be available for primary consumers? how did you calculate this?

10% energy is in the primary consumer stage. Every level you go down by 90% of the previous level. So if you start at 100% at the bottom of the pyramid, the next step is 10%, then the next step is 1% and so on

The amniotic egg was an evolutionary invention that allowed the first reptiles to colonize dry land more than 300 million years ago. Fishes and amphibians must lay their eggs in water and therefore cannot live far from water. ... Within the chorion is the amnion, the membrane for which the amniotic egg is named.

Explanation: