Which of the following is NOT an advantage of having a true coelom?
A. The digestive system can be coiled and provide greater surface area.
B. In some animals, fluids here can assist respiration and circulation, and accumulate metabolic wastes
C. Muscle contractions against the fluid chambers are absorbed and have no effect
D. In some animals, sperm and eggs can be stored before they are released.
Ans: C. Muscle contractions against the fluid chambers are absorbed and have no effect
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What phenomenon accounts for the appearance of chloroplasts in some unicellular phototrophic eukaryotes?
A) endosymbiosis B) secondary endosymbiosis C) sequencing of chloroplasts' SSU genes D) horizontal gene transfer
The propagation cycle that occurs in acid mine drainage is caused by
A) reduction of Fe3+ by sulfuric acid. B) the oxidation of sulfide to sulfuric acid by microbial oxidation of iron (Fe3+). C) microbial sulfate reduction. D) low pH and high oxygen concentrations.
The lateral line is part of the system to
a. process light. b. sense electrical currents in the water. c. control balance. d. detect vibrations. e. detect dissolved substances.
In what part of vascular plants are tracheids found?
A. rhizoids B. phloem C. cell walls D. xylem