Dandelions, Taraxacum officinale, are plants that asexually produce fruitlike propagules. Sexual reproduction is very rare in this organism. Which species concept would be least useful in defining dandelions as a species?
A. Phylogenetic species concept.
B. Biological species concept.
C. Evolutionary species concept.
D. Ecological species concept.
E. Both the evolutionary and ecological species concepts.
B. Biological species concept.
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In eukaryotes, the DNA molecule that comprises a chromosome is ____ and has ____ replication origin
a. circular, one b. circular, more than one c. linear, more than one d. linear, one e. linear, no
The immunoglobulin/s found on the surface of B cells is/are
A. IgD and IgE. B. IgD only. C. IgM only. D. IgG only. E. IgM and IgD.
Choose the letter of the best match from the following:A. hypocotylB. endospermC. scutellumD. radicleE. epicotylThe part of the stem axis that extends above the cotyledons in some seedlings.
Fill in the blank(s) with the appropriate word(s).
Which city is considered a brown-air city because the pollutants in the air undergo chemical reactions in the sunlight to form smog?
A. Boston B. Philadelphia C. New York D. Los Angeles E. All of the choices are correct.