Which of the following types of interactions is advantageous for one species, but has a negative effect
on the other?
a. predation
b. herbivory
c. mutualism
d. parasitism
e. predation, herbivory and parasitism
E
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Photosynthetic protists are informally referred to as:
A. protozoa. B. plants. C. fungi. D. algae.
Which of the following statements about DNA is (are) true?
A) DNA contains thymine but not uracil. B) DNA molecules contain deoxyribose. C) In a double-stranded DNA molecule, adenine on one strand will be connected to thymine on the complementary strand by two hydrogen bonds. D) All of the above statements are true.
Animals such as hydras and jellies can exchange gases directly with the environment by ________
A) diffusion B) active transport C) osmosis D) bulk transport
Without the activities of microorganisms, the functioning of earth's ecosystems would cease.
Answer the following statement true (T) or false (F)