Dr. Ratard was trying to determine the cause of a mysterious epidemic affecting fish in the gulf of New Mexico. His proposal that the deaths were caused by an organism called a protist is considered a(n) _________

A. theory.
B. data set.
C. hypothesis.
D. conclusion.
E. experiment.


C. hypothesis.

Biology & Microbiology

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During which meiotic phases does oogenesis arrest?

A. prophase I and metaphase II B. prophase I and prophase II C. metaphase I and prophase II D. metaphase I and metaphase II E. metaphase I and anaphase II

Biology & Microbiology

Which of the following terms is mismatched with its meaning or characteristics? 

A. Diploblastic—ectoderm and mesoderm B. Triploblastic—ectoderm, mesoderm, and endoderm C. Parazoa—lacks symmetry; no tissues D. Eumetazoa—definite symmetry; tissues organized E. Chordate—animal with notochord

Biology & Microbiology

Source habitats are areas where reproductive success is less than local mortality. Indicate whether the statement is true or false

Biology & Microbiology

Which of the following statements regarding membrane function is false?

A) The plasma membrane forms a selective barrier around the cell. B) The plasma membrane plays a role in transferring signals to the cell's interior. C) The plasma membrane has receptors for chemical messages. D) The plasma membrane is the control center of the cell.

Biology & Microbiology