Which two structures would provide a positive identification of an animal cell under a microscope? a. lysosome, flagellum b. golgi apparatus, mitochondrion c. plasma membrane, endoplasmic reticulum d. cell wall, chromatin

1. variations in a population of moths allow for some of its members to be able to adapt to environmental changes. the better adapted of the moths will be able to survive the change and thus prevail as the “fittest” of the species. (a) describe three mechanisms in which variation can occur within a species population. (b) explain which mechanism or mechanisms would be responsible for the survival of a population of peppered moths better than white moths in an environment affected by industrial soot. justify your answer.

Which layer will become saturated first when rain falls?

Aperson with age is more likely to catch diseases that healthy people usually don’t catch.what are these infections called?