The single greatest threat to biodiversity comes from ________
A) habitat destruction and fragmentation
B) invasive species
C) overexploitation
D) pollution
A
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Four of the five conditions listed below are caused
by chromosomal nondisjunction. Select the exception. a. Down syndrome b. Huntington disease c. Turner syndrome d. Klinefelter syndrome e. trisomy 21
Because enzymes affect the speed of chemical reactions without being consumed, they are referred to as:
a. catalysts. b. cytochromes. c. activation energy. d. hydrogen acceptors. e. transformation proteins.
The beating of cilia and flagella occurs by means of _______-based _______.
a. dynein; microtubule sliding b. kinesin; microtubule sliding c. myosin; microfilament sliding d. tubulin; microtubule contraction e. dynein; microtubule contraction
________ isolating mechanisms include improper development of hybrids and failure of hybrids to become established in nature.
Fill in the blank(s) with the appropriate word(s).