Which members of a Lophotrochozoan phylum are acoelomate and dorsoventrally flattened, and lack circulatory or respiratory systems?
a. Mollusca
b. Annelida
c. Rotifera
d. Platyhelminthes
Ans: d. Platyhelminthes
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a. hair cells c. cone cells b. rod cells d. neuroglia
Answer the following statements true (T) or false (F)
1. Natural selection is random because no individuals are eliminated from reproducing due to different environments. 2. Evolution occurs in individuals, not populations. 3. In an evolutionary sense, fitness refers to an organism's contribution to the next generation's gene pool. 4. Since the conditions needed for the Hardy-Weinberg principle do not occur in real populations, this principle has no importance in population studies. 5. Nonrandom mating, gene flow, and genetic drift are mechanisms of microevolution.
Like the kidney, a dialysis machine leaves what in the blood?
A. water B. waste C. blood cells D. salt E. glucose
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.