An open space within the gastrula is the _____

A) ectoderm
B) mesoderm
C) archenteron
D) endoderm
E) neural crest cells


Answer: C

Biology & Microbiology

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Which of the following scenarios describe an ecological succession?

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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

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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.

Biology & Microbiology

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.

Biology & Microbiology