The proposal that a human sperm contained a miniature human being is consistent with the now-discredited theory of development known as
A) epigenesis.
B) preformation.
C) cell differentiation.
D) morphogenesis.
E) cell theory.
Answer: B) preformation.
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When an individual's immune system responds to an appropriate antigenic stimulus during the course of daily activities, this is called
A. naturally acquired passive immunity. B. artificially acquired passive immunity. C. artificially acquired active immunity. D. naturally acquired active immunity.
The Viking landers searched for life on ____________
Fill in the blank(s) with correct word
Which of the following organic macromolecules provides energy as well as structure to plants and animals?
a. proteins b. lipids c. carbohydrates d. nucleic acids
Which of the following groups of species represents a guild?
A) species of birds that feed on nectar B) species of plants that use the C3 pathway of photosynthesis C) species of plants that tolerate shade D) species of plants or animals that are iteroparous