Which of the following statements is true of the alternation of generations in pine trees?
A. There are two types of cones:
gametophyte cones and sporophyte cones.
B. There are two types of cones: ovule cones
and pollen cones.
C. Pollination is immediately followed by
fertilization.
D. The spore in a pollen grain divides through
meiosis to produce sperm.
E. The eggs produced in female cones
become the seed.
B
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The heart chamber that passes blood to the lungs is the
A. left ventricle. B. right ventricle. C. right atrium. D. left atrium.
The age of the Earth according to modern estimations is about
A. 8 billion years. B. 4.6 billion years. C. 3.5 billion years. D. 1.5 billion years. E. a few thousand years.
All of the following could result in an increase in the genetic variety within a gene pool except
A. mutation within the gene pool. B. migration of individuals into the gene pool from other subspecies. C. sexual reproduction with individuals of other gene pools. D. selective breeding that creates individuals with specific sets of characteristics.
"Lucy," who belongs to the group ________, was a bipedal hominin with a brain smaller than that of humans
A) Australopithecus B) Homo erectus C) Ardipithecus D) Homo habilis