An open space within the gastrula is the _____
A) ectoderm
B) mesoderm
C) archenteron
D) endoderm
E) neural crest cells
Answer: C
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Which of the following scenarios describe an ecological succession?
A. The site of a volcano eruption that is going back to its pre-eruption state B. The regrowth of a forest after a fire C. An old field left abandoned that transforms back into a forest over time D. All of the above are examples of ecological succession
The species-area effect for island habits is greater than that for contiguous habitats because
a. colonization rates are higher and extinction rates are lower in contiguous habitats than islands b. extinction rates are higher in contiguous habitats c. all islands have low species richness d. large islands have lower species richness than contiguous habitats Chapter 53 - Population Interactions and Community Ecology Cengage Learning Testing, Powered by Cognero Page 20 e. immigration cannot be measured in contiguous habitats
The weakest symbiotic association, in which one
species simply lives better in the presence of another species is a. commensalism. b. competitive exclusion. c. mutualism. d. facultative obligate mutualism. e. parasitism.
In the visual pathway information is sent from the photoreceptor cells in the retina directly to the
ganglion cells. Indicate whether the statement is true or false.