Apples that we find in the grocery store today are much larger and sweeter than those found in the wild hundreds of years ago. Which process is responsible for this change?
A. Resistance to pesticides
B. Artificial selection
C. Genetic drift
D. Survival of the fittest
Answer: B
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Voltage-gated channels are:
a. open in a resting neuron but closed during an action potential b. open in a resting neuron and open during an action potential c. closed in a resting neuron but open during an action potential d. closed in a resting neuron and closed during an action potential e. always open
Red blood cells are
a. erythrocytes. b. leukocytes. c. platelets. d. all of the above.
Exchange of respiratory gases through the skin is a
characteristic of many a. fishes. b. amphibians. c. reptiles. d. mammals. e. birds.
The USFA recommends establishing a rehabilitation operation when the chill factor drops to ___ or lower.
a. 10 degrees F b. 20 degrees F c. 15 degrees F d. 25 degrees F