Both the innate and adaptive defenses of the immune system work to prevent
a. disease.
b. penetration by invading pathogens.
c. colonization by pathogens.
d. the penetration and colonization by pathogens, and the diseases they cause.
Answer: d. the penetration and colonization by pathogens, and the diseases they cause.
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a. sunlight b. rainfall c. cloud cover d. decomposing organic matter e. temperature
The most abundant polymer in the world is:
a. cellulose. b. glucose. c. hemicellulose. d. lignin. e. pectin.
Bioremediation is the process in which bacteria digest plants and release oily toxins
Indicate whether the statement is true or false
A keystone species is the most numerous species in an ecosystem
Indicate whether the statement is true or false