What is a major source of naturally produced sulfur in the atmosphere?

A. burning of fossil fuels
B. volcanic eruptions
C. denitrification
D. primary production
E. the upwelling of deep ocean water


B. volcanic eruptions

Biology & Microbiology

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The two most important alcohol germicides are ________ and ________.

A. methanol; isopropanol B. ethanol; isopropanol C. methanol; butanol D. ethanol; methanol

Biology & Microbiology

An estuary is observed as having dense seawater at the surface and freshwater at the bottom after strong winds. What is being exhibited?

a. Tidal overmixing b. Brackish water c. Well-mixed estuary d. Partially mixed estuary

Biology & Microbiology

There is concern that transgenic genes have been found in unrelated crops. Could such genetic

transformation occur with traditional breeding programs? What will be an ideal response?

Biology & Microbiology

The fusion of male and female gametes usually occurs in the upper third of the vagina. Indicate whether the statement is true or false

Biology & Microbiology