Mammals are different from birds in all these characteristics EXCEPT
A. mammary glands.
B. constant body temperature.
C. hair.
D. young born alive.
Answer: B
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Sponges move huge volumes of water through their bodies every day
Although this serves the function of filter feeding for the organism, how might this also provide an "ecosystem" service (something that affects and/or benefits other organisms in their environment)? A. They can filter small poisonous fish out of the water that may harm other organisms. B. They create small currents in their microenvironment that help to circulate and clean water locally for other organisms. C. They produce large numbers of gametes that will become food for other sponges.d. Their body chambers serve as places where smaller organisms can live and be protected from certain predators.
The type of DNA repair that fixes mistakes in nucleotide incorporation is known as ________ repair.
Fill in the blank(s) with the appropriate word(s).
A relationship which benefits flow both ways
between the interacting species is
a. a neutral relationship. b. commensalism. c. competition. d. mutualism. e. parasitism
Which statement is NOT true about the development of an action potential?
Select one: a. There is a rapid change in polarity from about -65 mV to about +40 mV. b. It requires two types of gated channels. c. The action potential ends when the polarity across the membrane reaches +40 mV. d. Depolarization occurs when sodium gates open and allow sodium ions to enter the cell. e. Potassium gates open after the sodium gates and allow potassium ions to leave the cell.