Some invertebrates do not have special respiratory organs and rely on __________ exchange, diffusion

of gases across the body surface. Fill in the blank(s) with the appropriate word(s).


integumentary

Biology & Microbiology

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The characteristics of a pathogen that determine its virulence include which of the following?

A. Infectivity B. Invasiveness C. Pathogenicity D. All of the choices are correct.

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Platelets function in _____

a. oxygen transport c. thermal regulation b. hemostasis d. both oxygen transport and hemostasis

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Pigments in chloroplasts:

a. melanin b. keratin c. chlorophyll

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Which of the following may form one colony?

A. A short chain of bacteria B. A single bacterial cell C. A small clump of bacteria D. All of the choices are correct.

Biology & Microbiology