The source pool for an island can be

A. the mainland.
B. another island.
C. secondary succession.
D. the mainland or another island.
E. density transition.


D. the mainland or another island.

Biology & Microbiology

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Which of the following is not a feature of a seed?  

A.  It contains a protective coat formed from the outer layers of ovule cells. B.  The embryo is surrounded by nutritive tissue or has cotyledons that contain nutritive tissue. C.  It contains a large percentage of water to support the embryo. D.  It is a complex structure that allows the embryo to be dispersed to distant sites. E.  Environmental signals such as light or temperature can trigger germination.

Biology & Microbiology

Which number identifies a sequence that is transcribed but not translated?

a. 2 b. 3 c. 4 d. 5 e. 6

Biology & Microbiology

Visual information is carried from the retina to the brain via

A) the optic nerve. B) rhodopsin. C) photopsins. D) the blind spot.

Biology & Microbiology

A molecule that induces an immune response within an organism is called

A. an antibody. B. a lymphocyte. C. an interleukin. D. an antigen.

Biology & Microbiology