The courtship rituals of many related animals are highly species-specific and prevent the related species from mating. This is an example of
A. habitat preference.
B. ecological isolation.
C. seasonal isolation.
D. behavioral isolation.
D. behavioral isolation.
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Which factors besides sunlight influence the rate of primary productivity?
a. temperature and total number of organisms b. photosynthesis and availability of nutrients c. temperature and availability of water d. photosynthesis and availability of water e. temperature and photosynthesis
In a karyotype, the chromosomes are arranged in order from
A. largest to smallest, including the sex chromosomes. B. largest to smallest, with the sex chromosomes at the end. C. smallest to largest, including the sex chromosomes. D. sex chromosomes first and then smallest to the largest. E. smallest to largest, with the sex chromosomes at the end.
Could a varying, self-replicating population of RNA molecules be considered alive?
A) No, because such a population would not be contained inside a cell. B) Yes, because such a population would show variation, inheritance, and selection. C) No, because RNA molecules are not subject to selection. D) Yes, because RNAs code for proteins that can then replicate the RNAs. E) No, because ribonucleotides are not suited for energy transfer functions.
What is the last structure that a sperm travels through as it leaves the body?
A. Ureter B. Urethra C. Vas deferens D. Ejaculatory duct E. Epididymis