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