Plants as well as brown, green, and red algae show a basic life cycle that involves the alternation of generations between a(n)
A. spore and pollen.
B. egg and a sperm.
C. seed and a cone.
D. megaspore and a microspore.
E. sporophyte and a gametophyte.
Answer: E
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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.
Horozontal rows of parenchymal cells that tranport materials horizontally are called?
A. rays B. tracheids C. vessel elements D. fibers E. sieve tubes
List some of the environmental factors that are potentially associated with male and female infertility?
What will be an ideal response?
The term that describes the diffusion of water is:
A) simple diffusion. B) osmosis. C) equilibrium. D) facilitated diffusion. E) active transport.