Which of the following belongs to the phylum
characterized by a mantle and a radula?
a. lobster
b. rotifer
c. octopus
d. sand dollar
e. polychaete
Answer: c
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A female aphid reproduces parthenogenetically to create a colony of 10 clones of herself. Five of these individuals become "soldiers" and do not reproduce; instead, they defend the other five reproductive individuals from predatory insects
Consider a single soldier and a single reproductive female. From the soldier's perspective, each of that reproductive female's offspring are genetically equivalent to the soldier's own: A. siblings. B. offspring. C. nieces/nephews. D. first cousins. E. grandchildren.
The letter "C" in the accompanying figure represents which teeth?
a. incisors b. molars c. canines d. premolars e. grinders
What was the probable role of oxygen gas in the early stages of life's appearance on Earth?
A) Cellular respiration, which depends on oxygen availability, provided abundant energy to the first life-forms. B) Oxygen promoted the formation of complex organic molecules through physical processes. C) Oxygen gas tends to disrupt organic molecules, so its absence promoted the formation and stability of complex organic molecules on the early Earth. D) Abundant atmospheric oxygen would have created an ozone layer, which would have blocked out ultraviolet light and thereby protected the earliest life-forms.
Crop rotation occurs where different types of plants are grown on the land each season. If you had no access to chemical fertilizers, which of the following would be best to include in your rotation cycle?
A) beans B) cotton C) corn D) tobacco