The study of life’s origins and distribution in the universe is called
a. astronomy.
b. xenology.
c. volcanology.
d. lunology.
e. astrobiology.
ANSWER: e
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According to the concept of ___________, species evolve continuously over long spans of time.
Fill in the blank(s) with the appropriate word(s).
What characterizes a thermocline in a temperate zone lake?
1.The layer above it is warm and has lots of oxygen. 2.The layer below it contains the warmest water. 3.It occurs in the spring as the air warms and ice melts. 4.It is very rich in oxygen.
The center for control of motor skills and
posture is the a. cerebrum. b. pons. c. cerebellum. d. thalamus. e. hypothalamus.
Which technique can be used to identify Down syndrome in a developing fetus?
A) PCR B) Southern blot C) Chorionic villus sampling D) Gel electrophoresis E) RFLP