Which of the following is NOT a trend evident
to plant evolution?
a. increasing independence from water
b. development of vascular tissue
c. increasing dominance of the gametophyte
generation
d. evolution from one type of spore to two
types of spores
e. increasing dominance of the diploid phase
of the life cycle
C
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The showy leaflike parts of flowers with distinctive colors, patterns, and shapes that help attract pollinators are known
as ____.
a. sepals b. petals c. stamens d. filaments e. carpels
Chemical evolution concentrated the various smaller molecules into the more stable forms
a. True b. False Indicate whether the statement is true or false
Which of the following statements regarding schistosomiasis is incorrect?
A. Once a person has recovered from an infection with Schistosoma mansoni, they are protected with lifelong immunity. B. Schistosomiasis is transmitted by exposing the skin to a water source that has been contaminated with sewage. C. There is only a single drug available to treat Schistosoma infection, praziquantel, and drug-resistant strains are beginning to arise. D. Efficacy of treatment is assess by observing fecal samples placed in water for whether eggs can hatch to release live miracidia.
What relationship between prairie dogs and mesquite is suggested by this experiment?
a. Prairie dogs and mesquite appear to be unable to co-exist. b. Mesquite seems to preclude establishment of prairie dog communities. c. Prairie dog communities seem to preclude the establishment of mesquite. d. All of the above.