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A facultative anaerobe is an organism that can grow and reproduce effectively ___.

Protozoans are found primarily on land.

Which can have a cellular form as well as a plasmodial form with multiple nuclei?

Atoms with the same atomic number but a different atomic mass are known as isotopes.

Fungi are non-motile.

Antibiotics are effective against most viral infections because they interfere with the viruses ability to metabolize.

If a microscope is in focus with a lower power, it will almost be in focus with the next higher power.  What is the term for this?

These macromolecules are made of amino acids and have various structural and metabolic roles. 

Eukaryotic, mainly unicellular, both auto- and heterotrophic, sexual and asexual reproduction describes the ___.

Membrane bound vesicles that contain hydrolytic enzymes.