Several groups of protists have variable modes of nutrition: Some species are photoautotrophs, whereas close relatives are heterotrophs. Such diversity even exists within a single species in some cases. Evidence suggests that this pattern is a result of the __________.
Fill in the blank(s) with the appropriate word(s).
Answer: independent acquisition of green and red algae as endosymbionts by many protist groups, with subsequent evolution producing photosynthetic organelles
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The random changes in gene pool from one generation to the next is termed what?
a. gene flow b. genetic drift c. mutations d. natural selection
A population that has experienced a genetic bottleneck and lost its genetic variability can never again attain substantial numbers.
a. true b. false
Answer the following questions using the five groups listed below:
A. These bacteria can live in water of very high salt concentration. B. The only bacteria that uses the noncyclic photosynthetic pathway. C. These bacteria live in temperatures that are not usually conducive to life. D. These are the most diverse monophyletic group of bacteria. E. These produce CH4.
A plant will only flower if the night length is longer than 14 hours. This plant is a
A) long-day plant. B) short-night plant. C) short-day plant. D) day-neutral plant.