Following implantation, the multiplying cells of the human embryo reorganize to form a gastrula which contains the three primary germ layers
A. true
B. false
A
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A hypothetical endangered species of wildflower has been reduced to a single small population in a mountain meadow. A rare early spring blizzard kills all but 3 of the remaining plants, one of which has a rare mutation. This is an example of:
A. natural selection. B. sexual selection. C. genetic drift/bottleneck. D. genetic drift/founder event. E. None of the answer options are correct.
An oak tree can support hundreds of beetles, caterpillars and other primary consumers. This is an example of
A. a pyramid of biomass. B. excessive levels of primary production. C. an unusually diverse group of primary consumers. D. primary parasitism. E. an inverted pyramid.
A good range of temperature to store food is ________.
A. 20° to 80°C B. below 10°C and above 80°C C. below 4°C and above 60°C D. below -10°C and above 100°C E. 0° to 50°C
Genetic diseases transmitted only by a mother to both sons and daughters result from ____________________ genesFill in the blank(s) with the appropriate word(s)