Which disease and parasitic organism(s) are INCORRECTLY matched below?
a. amebiasis – Entamoeba histolytica
b. Chagas disease – Trypanosoma cruzi
c. malaria – Plasmodium spp.
d. toxoplasmosis – Schistosoma mansoni
Answer: D
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Which characteristic is common to all groups represented on this evolutionary tree?
a. vertebrae b. bony skeleton c. four limbs d. amniotic egg or sac
Fishes that are very active swimmers have a ____ body
a. fusiform b. laterally compressed c. globular d. flattened e. dorso-ventrally compressed
During a study session about evolution, one of your fellow students remarks, "The giraffe stretched its neck while reaching for higher leaves; its offspring inherited longer necks as a result." Which statement is most likely to be helpful in correcting this student's misconception?
A. Disuse of an organ may lead to its eventual disappearance. B. Only favorable adaptations have survival value. C. If the giraffes did not have to compete with each other, longer necks would not have been passed on to the next generation. D. Characteristics acquired during an organism's life are generally not passed on through genes. E. Spontaneous mutations can result in the appearance of new traits.
Which of the following is a common selective agent for natural selection?
A. mutations B. competition for food and other resources C. sex ratio D. population size