The current rapid loss of species is considered by many scientists to be another mass extinction. What may be causing this increase in extinction rate, beyond background extinction?

A) a recent increase in earthquakes worldwide
B) human population growth and the resulting habitat changes worldwide
C) global climate change
D) changes in the number of solar flares observed recently


B

Biology & Microbiology

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. When performing an experiment, what is another word used to describe the treatment?

a. hypothesis b. control c. variable d. data

Biology & Microbiology

When soil is dry, guard cells respond to _____ by collapsing against one another, so stomata close

a. air temperature c. abscisic adic b. low humidity d. oxygen

Biology & Microbiology

The expectation of a meal normally stimulates the release of _________ into the blood, which reduces blood glucose.

What will be an ideal response?

Biology & Microbiology

Which antibodies in tears, saliva, and mucus help protect mucosal surfaces from many pathogens?

a) IgD b) IgA c) IgG d) IgM

Biology & Microbiology