Which of the following is NOT a characteristic of

birds?
a. feathers modified from scales
b. a four-chambered heart
c. excellent vision
d. migratory behavior
e. teeth


Answer: e

Biology & Microbiology

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The composition of plasma is not fully known due to its complexity

Indicate whether the statement is true or false.

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Hemocyanin:a

combines irreversibly with oxygen for transport within the body of various organisms. b. is bright red in color when combined with oxygen. c. has an iron-porphyrin group that is responsible for oxygen transport. d. is a respiratory pigment found in the blood of some invertebrate and vertebrate species. e. is a respiratory pigment that is colorless when deoxygenated.

Biology & Microbiology

Which of the following components is NOT involved in the phosphorus cycle?

A) Some rocks and soil B) The atmosphere C) Consumers D) Decomposers E) Producers

Biology & Microbiology

The movement of individuals from one population to another can alter the allele frequencies in one or both of the populations. This is an example of ______.

a) genetic drift b) mutation c) gene flow d) natural selection

Biology & Microbiology