In general, the form of energy that is least useful to living organisms is
a. chemical.
b. electrical.
c. heat.
d. light.
e. sound.
C
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Metanephridia differ from protonephridia in all of the following ways except:
A. the urine produced in both systems is more dilute than the body fluids. B. metanephridia are surrounded by an extensive capillary network, whereas protonephridia are not. C. selective reabsorption of materials occurs via cells lining the tubules in protonephridia and via capillaries in metanephridia. D. fluid enters metanephridia through a funnel -shaped opening. E. fluid from the body cavity enters protonephridia without first being filtered.
Of the following molecules, which passes through a lipid bilayer most readily?
A. carbon dioxide B. glucose C. K+ D. arginine E. RNA
Do you agree with geneticists that there is no genetic basis to divide humans into races? Why or why not?
What will be an ideal response?
During the Pleistocene epoch, plant communities changed dynamically in response to which mechanism?
a. a meteor impact b. iridium in the soil c. fluctuating climates d. intense grazing pressure e. competition with gymnosperms