When a red tide occurs, huge numbers of microscopic organisms are filtered out of coastal waters by oysters and clams. This sometimes causes the shellfish to become toxic to people who eat them
The organisms that create the red tide are classified as
A) red algae.
B) slime molds.
C) diatoms.
D) euglenids.
E) dinoflagellates.
E
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The pressure of a gas is proportional to its density and ________.
A) altitude B) adiabatic rate C) temperature D) chemical composition E) friction.
Explain how sexual reproduction leads to genetic variation. What is the evolutionary significance of this variation?
What will be an ideal response?
Ecdysone, or chemicals that mimic ecdysone, are sometimes used as ____
a. insecticides b. fungicides c. herbicides d. fungicides and nematocides e. fertilizers
A dominant allele does not express itself in every person that contains it; occasionally parents without the characteristic have children that show the characteristic. This statement represents a feature known as
A. fitness. B. expressivity. C. recessiveness. D. penetrance.