What vessels transport oxygenated blood from placenta to fetus?
a. umbilical arteries
b. umbilical veins
c. ductus venosus
d. foramen ovale
e. ductus arteriosus
ANSWER: b
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Why do moderate levels of disturbance result in an increase in community diversity?
A) Habitats are opened up for less competitive species. B) Competitively dominant species infrequently exclude less competitive species after a moderate disturbance. C) The environmental conditions become optimal. D) The resulting uniform habitat supports stability, which in turn supports diversity. E) Less-competitive species evolve strategies to compete with dominant species.
In a structural model of a molecule, a carbon atom may be represented by a ________
a. blue sphere only b. letter C or corner with no symbol c. corner with no printed symbol only d. black sphere only
The first hominin to have enough uniquely human features to be placed in the same genus as modern humans is Homo
erectus. ____________________ Indicate whether the statement is true or false.
Which of the following can establish a subcutaneous infection known as a mycetoma?
A. Microsporum B. Candida albicans C. Pneumocystis jirovecii D. Mucor E. Pseudallescheria