A rise in oxygen in Earth's air and seas put organisms that engaged in _____ at a selective advantage
a. aerobic respiration
b. fermentation
c. photosynthesis
d. sexual reproduction
A
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The zoo decides to keep all of Gus and Ida's descendants under zoo conditions for the next 30,000 years. They breed only with each other. You visit the zoo in 30,000 years and see their offspring
Do you expect their offspring, which are alive in 30,000 years, to be identical in genotype and phenotype to Gus and Ida? Keep in mind, polar bears start reproducing when they are between 5 and 10 years old, and adult females give birth to two cubs every 2-3 years. A. Yes, because evolution only occurs in nature. B. Yes, because they had a small population to begin with (only two bears), so there was little genetic variation to start. C. No, because mutation would occur occasionally and there are selective pressures that exist in artificial as well as natural environments. D. Maybeâ€"it depends on mutation rates and strength of selective pressures.
Unlike plants, fungi, and bacteria, animal cells
cannot resist volume increases in hypotonic environments. This is because unlike those other organisms, animal cells
a. do not have central vacuoles. b. do not have cell walls. c. do not have pumps that can actively pump out excess fluid. d. are smaller than those other cells and thus cannot handle large increases in volume. e. have relatively more solutes
Predation always has a negative effect on the individual prey
Indicate whether the statement is true or false
Which are the three main roles played by organisms in community life?
a. producer, detritivore, decomposer b. consumer, detritivore. decomposer c. producer, consumer, decomposer d. facilitator, decomposer, consumer e. realized niche, fundamental niche, habitat