The first reefs on earth were built by:

A. bacteria.
B. calcified sponges.
C. proteinaceous sponges.
D. algae.
E. corals.


A

Biology & Microbiology

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A toxin that is secreted and acts upon a specific cellular target is called a(n)______

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

Biology & Microbiology

Carbon-14 is useful in determining the age of a fossil up to about

A. 40,000 years ago. B. 10,000 years ago. C. 20,000 years ago. D. 50,000 years ago. E. 100,000 years ago.

Biology & Microbiology

The Vienna Convention for the Protection of the Ozone (1985) and the Montreal Protocol (1987) included agreements for the phasing out of:

A) nuclear weapons. B) synthetic pesticides. C) chlorofluorocarbons. D) emissions of carbon dioxide. E) smelting of heavy metals.

Biology & Microbiology

In his book The Origin of Species, Darwin argued that species living today descended from a succession of ancestral species. What mechanism did Darwin propose to explain how evolution occurs?

A. competition B. natural selection C. artificial selection D. overproduction

Biology & Microbiology