The cnidarians have an incomplete gut (having only one opening) called the:
a. nematocyst.
b. coelom.
c. gastrovascular cavity.
d. pseudointestine.
e. spongeocoel.
C
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Which one of the following scientists tested the hypothesis that microorganisms can arise by spontaneous generation?
A. Elena and Lenski B. Redi C. Pasteur D. Darwin E. Alvarez
When did the Earth and other planets of our solar system form?
a. 1.2 billion years ago b. 4.6 billion years ago c. 7.2 billion years ago d. 5 billion years ago e. 13 billion years ago
The intestinal parasite Ascaris lumbricoides currently infects more than one billion people. Which group is it in?
a. flatworms b. roundworms c. annelids d. cnidarians e. arthropods
The bacterium Streptococcus mutans has a major role in the development of dental plaque and caries
Indicate whether the statement is true or false