What type of symbiotic relationship is exemplified by mycorrhizal fungi?
A. Parasitism
B. Commensalism
C. Atavism
D. Mutualism
Answer: D
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What is population variation?
a. variation between two adjacent populations b. variation that results from two populations mixing and interbreeding c. the distribution of phenotypes among individuals in a population d. a gradient of change from one edge of a population to the other
An x-shaped appearance of chromosomes during the process of meiosis provides evidence of
a. irradiation damage. b. crossing over. c. chromosomal aberration. d. fertilization. e. spindle fiber formation.
Through control of gene expression, a bacterial cell responds to changing ________ conditions.
A. internal B. protein C. genetic D. environmental
Plants help reduce flooding by
A) removing soil. B) breaking down the soil. C) decreasing the amount of water returned to the air. D) increasing CO2 levels. E) increasing the soil's ability to hold water.