If the age structure of a country shows a large base and a tapering shape, we would guess that the population of this country will ________
A) stay the same as it is now
B) decline in number
C) increase in number
D) We cannot predict population change using age structure.
C
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Tris-BP was banned after the discovery that the chemical caused cancer in test animals and was ____________________ through the ____________________ by those wearing treated clothing
Fill in the blank(s) with correct word
What is the best description of double fertilization in angiosperms?
A. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the ovary, which becomes the fruit. B. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the polar nuclei, which forms the endosperm. C. One sperm fertilizes the egg, which develops into the embryo; the other sperm fertilizes the polar nuclei, which forms the seed coat. D. One sperm fertilizes the egg, which develops into the embryo; the other sperm produces the pollen tube. E. One pollen grain fertilizes the embryo sac; the other sperm fertilizes the pollen grain.
Which of the following is false about plant
hormones? a. They bind to receptors on target cells. b. Their mechanism of action is completely different from that of animal hormones. c. Signal transduction may influence a metabolic pathway. d. The plant response may depend on a change in gene expression. e. Signal transduction may involve shape change by a receptor.
Traits are critical in the study of phylogeny because:
a. A phylogenetic tree is a hypothesis about evolutionary relationships. b. We need to use observation of traits to infer patterns of ancestry and descent among popula-tions. c. By mapping individual traits onto a phylogeny we have already created, we can study the se-quence and timing of evolutionary events. d. B and C. e. A and C.