Ancestors of ____ may have possessed mitochondria, which were lost or reduced during evolutionary history
a. Paramecium
b. Laminaria
c. Amoeba
d. Euglena
e. Giardia
e
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The tips of the branches on a phylogenetic tree represent:
A. present-day groups. B. common ancestors. C. analogies. D. sister groups. E. homologies.
Which of the following is the direct cause of the dead zone in the Gulf of Mexico?
A. decomposition of algal blooms by aerobic bacteria B. eutrophication C. fertilizer runoff from agricultural fields D. increased growth of algal populations E. ocean acidification
The top risk factor for cardiovascular disease is
a. tobacco smoking. b. family history. c. hypertension. d. obesity. e. diabetes mellitus.
What is a benign tumor?
A. fluids that travel to other locations B. a mass of cells that invades other tissues C. a fluid-filled sac under the skin D. a mass of cells that remains in one area