These are nonphotosynthetic plankton, including aquatic protozoa and tiny animals. 

A. phytoplankton
B. thermophiles
C. zooplankton
D. diatoms


C. zooplankton

Biology & Microbiology

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Microbes were first formally observed during the mid-1600s, but the cell theory was not enunciated until 1839. Write a brief essay explaining why microbiology did not become a formally recognized science until Louis Pasteur's and Robert Koch's time

What will be an ideal response?

Biology & Microbiology

The primary reason for hybrid sterility is

a. the inability of the hybrid to attract a mate. b. the difficulty in finding a suitable habitat in which to survive. c. that the hybrids are usually weak and have difficulty surviving to reproductive maturity. d. that hybrids cannot produce viable gametes. e. the inability of the hybrid to develop an appropriate courtship pattern.

Biology & Microbiology

What are alleles?

A. the dominant form of a gene B. the locations of genes on a chromosome C. genes for different traits, such as hair color or eye color D. alternative forms of a gene for a single trait, such as blue eyes or brown eyes E. the recessive form of a gene

Biology & Microbiology

Why doesn't a tapeworm have a mouth on its scolex?

A. The mouth is on the proglottids. B. The mouth is located at the end of the pharynx. C. Tapeworms use a radula instead of a mouth to feed. D. Endoparasites don't need a mouth.

Biology & Microbiology