Although extinction is a natural process and is ongoing, it is likely we are in a time of ____, an event in which many
different kinds of organisms become extinct in a relatively short period.
a. mass extinction
b. genetic mutation
c. geologic catastrophe
d. loss of megafauna
e. birth of new species
ANSWER: a
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The tube-like structures extending from these
bacterial cells in the picture above to the underlying cells in the above figure are used for a. attachment. b. locomotion. c. whipping up proteins. d. breathing. e. communication
If a cell is placed in an isotonic medium, there will be no net movement of water.
a. true b. false
The equation for cellular respiration is: C6H12O6 + 6O2 ? 6CO2 + 6H2O. At what specific point in the cellular respiration process has glucose been broken down completely from a six carbon molecule to 6 molecules of CO2?
What are the intervertebral disks made of?
A. fibrocartilage B. skeletal muscle C. bone D. elastic cartilage E. hyaline cartilage