After Joseph Farman discovered, in 1985, that an ozone hole was developing over Antarctica, scientists measured levels of chemicals in the upper atmosphere. They found a surprising concentration of ozone-destroying:

A. chlorine
B. nitrates
C. helium
D. mercury


Answer: A

Biology & Microbiology

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Cells are involved in the process called ____________ immunity. Activated B cells become ____________ cells which produce ____________ . T cells are involved in the ____________ immune response, directly interacting with their target cells.

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

Biology & Microbiology

Involves aggregated data on the population level. ecologic fallacy

a. ecologic study b. case study c. repressed study d. none of the above

Biology & Microbiology

The diagnostic procedure that images the structures of the blood vessels and the flow of blood through these vessels is known as _________ .

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

Biology & Microbiology

Arrange in the right order: inoculation—incubation—isolation—inspection—identification

Indicate whether the statement is true or false.

Biology & Microbiology