what is the purpose of the first three phases of human testing?
a. to demonstrate that people want to take the drug
b. to explain how a drug is expected to treat a condition
c. to establish that a drug is both safe and effective
d. to increase the sales of the drug through prescriptions

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.

Some mining processes involve removal of large areas of earths surface in the mined region this practice causes severe environmental damage by allowing which natural process to accelerate in the affected areas? a.precipitation b.erosion c.migration d.condensation