What evidence does banded iron in rocks provide? a. origin of life
b. presence of oxygen in the atmosphere
c. emergence of photosynthesis
d. volcanic activity

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.

9. the history of life on earth is recorded in

What substance acts to prevent sudden ph changes in bodily fluids?