The evolution of seeds allowed for:
a. the development of an independent sporophyte.
b. coevolution with animal pollinators.
c. heterospory—the development of male and female gametophytes.
d. plants to colonize dryer climates.
e. All of the above are correct.
Ans: d. plants to colonize dryer climates.
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The Keeling curve in Figure 25.1 shows that while CO2 levels oscillate on an annual basis, overall CO2 levels increase from year to year. Why has this trend continued in the last 50 years?
A. increasing rates of aerobic respiration associated with the rise in world population B. decreasing rates of oxygenic photosynthesis by plants and algae C. clearing of forests to create agricultural land outside the tropics D. combustion of fossil fuels
Plaque is _____ caused by _____
a. an infectious disease; bacterial biofilms b. a non-infectious disease; inflammation of the gums c. an infectious disease; non-pathogenic bacteria d. a non-infectious disease; E. coli e. an infectious disease; E. coli
Which of these is a reasonable definition of a gene based on current understanding of biology?
Pseudopods are found on some
A. protozoa. B. algae. C. bacteria. D. blue-green algae.