By consuming the mussel Mytilus californianus, the sea star Pisaster ochraceous prevents the mussel from outcompeting other species. In this community, the seastar is acting as a:
1.Dominant competitor
2.Grazer
3.Keystone species
4.Scavenger
3
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When considering nomenclature for scientific names, what is the difference between the two primates, Homo sapiens and Homo erectus?
A. One is a primate but the other is not. B. They are animals of a different kingdom. C. They are animals of a different order. D. They are animals of a different species. E. They are animals of a different genus.
Genetic variability in sexually reproducing organisms arises within
A) crossover events between nonsister chromatids. B) crossover events between sister chromatids. C) egg and sperm genetic recombination from distinct individuals. D) egg and sperm genetic recombination from an individual. E) both choices B and C
Certain appendages of insects evolved into broad,
thin extensions for the purpose of a. walking. b. flight. c. feeding. d. copulation. e. swimming.
Which system picks up excess extracellular fluid and reclaimable solutes and returns them to the
cardiovascular system? a. urinary b. digestive c. reproductive d. venous e. lymphatic