Paleontologists have found fossils dating back 3.6 billion years. These closely resemble

a. nothing alive today.
b. blue-green algae present today.
c. small invertebrate animals.
d. today's simplest plants.
e. fungi.


B

Biology & Microbiology

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Which of the following is considered a cardinal growth temperature?

A. The minimum temperature B. The optimum temperature C. The maximum temperature D. All of these are considered cardinal growth temperatures.

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All pathways of complement activation follow the same sequence after C3

Indicate whether this statement is true or false.

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As elevation increases, O2 ____

a. availability increases b. availability decreases c. availability remains constant d. levels increase, but there is none present above 20,000 feet e. levels decrease, until there is none present above 20,000 feet

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High levels of what hormone increases the likelihood of fraternal twins?

a. FSH b. LH c. HCG d. progesterone e. estrogen

Biology & Microbiology