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
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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
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
The expectation of a meal normally stimulates the release of _________ into the blood, which reduces blood glucose.
What will be an ideal response?
Which antibodies in tears, saliva, and mucus help protect mucosal surfaces from many pathogens?
a) IgD b) IgA c) IgG d) IgM