Members of the phylum ____ exhibit radial symmetry, with their body parts arranged regularly around
a central axis.
a. Porifera
b. Mollusca
c. Cnidaria
d. Platyhelminthes
e. Chordata
C
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There are ________ common amino acids used to synthesize proteins.
A. 25 B. 61 C. 64 D. 20
Select all of the following that are valid counterarguments to the idea that evolution is "just a theory."
_____ Scientists use the word theory to describe unifying ideas. _____ Evolution is just a collection of facts without a central theme and this is not a theory. _____ Scientific theories are supported by many types of evidence and no empirical data refutes them. _____ Evolution occurred in the past, but it is not occurring in the present, so it cannot be a theory.
Which organisms are called extremophiles and flourish mostly in extreme conditions?
A) Protozoans B) Archaea C) Bacteria D) Fungi
Darwin's finches, collected from the Galápagos Islands, illustrate which of the following?
A) mutation frequency B) ancestors from different regions C) adaptive radiation D) vestigial anatomical structures E) the accuracy of the fossil record