Which of the following statements is CORRECT?
a) the scientific method can be used only to understand scientific phenomena
b) common sense is usually a good substitute for the scientific method when trying to understand the world
c) a hypothesis that does not generate a testable prediction is not useful
d) it is not necessary to make observations as part of the scientific method
Answer: c) a hypothesis that does not generate a testable prediction is not useful
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Which of the following is NOT an effect observed in the guard cells of stomata?
A) Guard cell shrinkage B) K+ exits guard cells C) Changes in membrane potential D) cell expansion driven by proton ATPases E) water exits guard cells
Which of the following are adhesion proteins that are present in both choanoflagellates and animals?
A. actins B. pectins C. cadherins D. hemoglobins
Which factors are density-independent?
a) predation and competition b) competition and unusual weather c) parasitism and disease and natural disaster d) natural disaster and unusual weather
Materials such as food, minerals, and oxygen are passed to cells through
A) water. B) interstitial fluid. C) matrix fibers. D) neurons.