Which of the following statements about environmental changes is true? a. Environmental changes always happen very quickly b. Environmental changes cause instant changes in different species. c. Environmental changes cause genetic mutations d. Environmental changes can make a genetic mutation more desirable

lizards have adapted to life in the desert. some desert lizards have toes with spiny scales to them run across the sand without sinking. some use the sand to hide from predators, or to search for small animals that they prey upon.

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.