Which embryonic tissue is defective if an embryo

develops into a creature that appears normal in
almost every aspect except for the lining of the
digestive tract?
a. ectoderm
b. endoderm
c. gastroderm
d. mesoderm
e. none of these


Answer: b

Biology & Microbiology

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A collection of clones containing all the DNA sequences carried by an individual is called a genomic library

a. True b. False

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When citing a reference in Ecology format, what is the first piece of information that should be included?

A. Author's first name B. Author's last name C. Article title D. Journal title E. Year of publication

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when its cold, the __ contracts and draws the testes closer to the body to keep them warm

Fill in the blank(s) with the appropriate word(s).

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What is a characteristic of eudicots?

A) parallel leaf venation B) vascular bundles scattered throughout the stem C) a flower with six petals D) a taproot system

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