Arthropods have which of the following features?
a. an open circulatory system
b. a three-chambered heart
c. a mantle cavity
d. a radula
a. an open circulatory system
Biology & Microbiology
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A physical relationship where an organism hosts more than one symbiont is known as a
A. consortium. B. clade. C. cojoining. D. partnership.
Biology & Microbiology
Net primary productivity cannot be measured in aquatic ecosystems
Indicate whether the statement is true or false
Biology & Microbiology
Which of the following is an example of a postzygotic mechanism for reproductive isolation?
A) behavioral isolation B) gametic isolation C) habitat separation D) mechanical isolation E) hybrid sterility
Biology & Microbiology
Members of the phylum __________ are the simplest organisms that have a separate mouth and anus
A. Platyhelminthes B. Ctenophora C. Cnidaria D. Porifera E. Placozoa
Biology & Microbiology