How does an increase in atmospheric greenhouse gases increase global temperatures?

A. By reacting with each other
B. By preventing some of the heat from escaping the planet's surface
C. By decreasing the ozone layer in the atmosphere
D. By increasing the amount of heat from the sun that reaches the planet's surface


Answer: B

Biology & Microbiology

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Which of the following describes the earliest

protist found in the fossil record?

a. single-celled, free-swimming, asexual reproduction, red alga b. multi-celled, stationary, asexual reproduction, red alga c. multi-celled, free swimming, sexual reproduction, red alga d. multi-celled, stationary, sexual reproduction, red alga e. single-celled, stationary, asexual reproduction, red alga

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The open area or central space in the GI tract is called the ________

Fill in the blank(s) with the appropriate word(s)

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The yearly rainfall of a desert biome is

A. 50 to 100 centimeters per year. B. more than 300 centimeters per year. C. less than 20 centimeters per year. D. 150 to 200 centimeters per year. E. more than 200 centimeters per year.

Biology & Microbiology

Progression through the cell cycle requires a cyclin to bind to a Cdk because _________

(a) the cyclins are the molecules with the enzymatic activity in the complex. (b) the binding of a cyclin to Cdk is required for Cdk enzymatic activity. (c) cyclin binding inhibits Cdk activity until the appropriate time in the cell cycle. (d) without cyclin binding, a cell-cycle checkpoint will be activated.

Biology & Microbiology