What does the globular stage of plant embryo development give rise to?
A. a heart-shaped dicot embryo
B. the suspensor of the germinating seed
C. a double monocot embryo
D. the monocot scutellum
E. the rhizoid of Fucus
A. a heart-shaped dicot embryo
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A single oak tree can support hundreds of beetles, caterpillars and other primary consumers. Such a phenomenon 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 of numbers.
Farmland that is under regular and continued tillage will not
a. undergo succession. b. produce a climax community. c. experience competition. d. suffer from the effects of disturbance. e. develop species diversity.
Too much calcium in the bloodstream, a condition called hypercalcemia, can be very dangerous. The thyroid gland releases a hormone, calcitonin, when calcium is too high. How does calcitonin lower calcium levels in the blood?
A) It reduces osteoclast activity and increases osteoblast activity. B) It increases osteoclast activity and reduces osteoblast activity. C) It reduces both osteoclast and osteoblast activity. D) It increases both osteoclast and osteoblast activity.
A clade is a __________ group that consists of an ancestor in which a derived character evolved, together with all of its descendant.
Fill in the blank(s) with the appropriate word(s).