The erosive ability of a river is affected by all of the following except
a- stream gradient.
b -stream discharge.
c -stream deposition.
d -stream load.

Which sequence correctly shows the path of carbon dioxide during repiration?

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.

How are mutations continually being generated in a population (what are some of the causes of mutatuions? ) explain