The adult human jawbone, or mandible, arises embryonically from a gill arch. The arch and the mandible are said to be ________
A) homologous structures
B) analogous structures
C) convergent structures
D) coevolved structures
A
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Provisioning services ____
a. are critical functions that preserve and recycle resources upon which ecosystems depend b. transfer CO2 to a nutrient compartment in the biosphere c. enable populations to function within their food webs d. describe the availability of plants, animals, and other materials useful to all organisms e. involves planting crops for use by many organisms
The carbon dioxide acceptor in the Calvin-
Benson cycle of photosynthesis is
a. phosphoglycerate (PGA). b. ribulose bisphosphate (RuBP). c. phosphoglyceraldehyde (PGAL). d. glucose. e. phosphoenolpyruvate.
Two individuals are members of the same species if
they a. possess the same number of chromosomes. b. breed at the same time. c. are phenotypically indistinguishable. d. can mate and produce fertile offspring. e. occupy the same habitat.
During wine-making, yeast cells obtain energy by fermenting sugar. Alcohol and CO2 are products of this process. When alcohol content reaches a certain level, the yeast cells can no longer survive. The limiting factor to yeast growth in this example is the
A. availability of raw materials. B. availability of energy. C. production of waste products. D. interactions with other organisms.