During which geological period did the greatest number of new body plans appear? Carboniferous      

Refer to the graph showing variations in oxygen levels during Earth’s history.Which of the following can be concluded from the graph?

The most important factor in determining the type of biome to develop in a given area of those listed is

Leukotrienes result in increased secretions in airways.

Sucralfate is used to treat peptic ulcers caused by NSAIDs.

Demographers usually measure mortality in terms of

Which laxative do intestinal bacteria use?

Environmental science is a __________.

“Abundance” describes the total number of _________ while “diversity” describes the number of _________.

Worldwide per capita use of water has