Genetic drift occurs when:
A) gene flow within the population is less than gene flow between populations.
B) the population has not yet stabilized.
C) reproduction is nonrandom within the population.
D) chance occurrences alter gene frequencies.
Answer: D
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List the primary germ layers formed by gastrulation. What tissues will they form in the adult?
Endoderm: Mesoderm: Ectoderm:
Spermatophytes are:
A. all the kinds of plants that produce sperm B. all the living and fossil seed plants C. all the plants that have tracheids and phloem D. all the woody plants E. all the plants with a sporic life cycle
Which term refers to unicellular fungi?
a. yeasts b. hyphae c. mycelium d. molds
The first cells to encounter a threat to the body are
usually the _________ as they patrol body __________. a. neutrophils; surfaces b. macrophages; interstitial fluids c. mast cells; linings d. macrophages; tissues e. neutrophils; interstitial fluids