What two gases were most abundant on early Earth?

A) O2 and CO2
B) N2 and H2
C) CO2 and H2
D) CO2 and N2


Answer: C

Biology & Microbiology

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Endotherms have higher metabolic rates than do ectotherms and are therefore able to be active over a narrower range of environmental temperatures

A. true B. false

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Generally, heavy metals, except silver, have been proven to be too toxic for use on human tissue and are no longer used medically

Indicate whether this statement is true or false.

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Which types of human habitats harbor the most bacterial phylogenetic diversity? Which habitats harbor the most bacterial taxon diversity? What does the difference between phylogenetic diversity and taxon diversity suggest about these different habitats?

What will be an ideal response?

Biology & Microbiology

Which of the following can be considered a habitat corridor?

A) a large lake in a city park B) an abandoned agricultural field in an urban area C) a strip of forest along the banks of a river flowing from a forested mountain through a city D) a patch of forest within a city park

Biology & Microbiology