Ecologist Robert MacArthur observed that five species of similar warblers coexisted on spruce trees because they
A. ate different kinds of insects.
B. were actually subspecies of the same species.
C. cooperated in their foraging habits.
D. were kept below the carrying capacity by predators.
E. foraged in different places of the tree canopy.
Answer: E
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The process of fertilization
a. is random in the selection of which gametes fuse. b. is not random but selects for gametes with a greater number of paternal chromosomes. c. is not random but selects for gametes with a greater number of maternal chromosomes. d. is not random but selects for gametes with the fewest mutations. e. is not a source of genetic variability in progeny.
A thick filament of muscle is composed primarily of the protein
A. pectin. B. myoglobin. C. hemoglobin. D. actin. E. myosin.
Identify the levels of organization for protein molecules, and list the type(s) of bond(s) involved in
establishing each structural level.What will be an ideal response?
About half of all flowering plant species, including many important crop plants, belong to which category of chromosomes?
a. euploids b. haploids c. aneuploids d. polyploids