The "redshift" of a galaxy refers to the rate

A. at which is receding.
B. of its fusion.
C. at which it is approaching.
D. at which it is spinning.


Answer: A

Environmental & Atmospheric Sciences

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In terms of inputs of matter, the Earth is a closed system. As a result, nutrients must be recycled to support life

Indicate whether the statement is true or false

Environmental & Atmospheric Sciences

During which stage of the cell cycle does a cell grow to approximately double of its original size?

A. mitosis B. gap 2 C. synthesis D. gap 1

Environmental & Atmospheric Sciences

Coliform bacteria populations are routinely monitored in drinking water supplies, swimming pools, and at beaches because these bacteria

A. Are especially toxic to animals B. May mutate into severely pathogenic strains C. Are more difficult to find in water D. Indicate the presence of feces in water E. Usually live in pesticide-contaminated water

Environmental & Atmospheric Sciences

Compounds which contain a carbon-carbon double bond are classified as which of the following?

A) alkanes B) alkenes C) alkynes D) arenes

Environmental & Atmospheric Sciences