Annelids:A
have a visceral mass.
B. have a segmented body.
C. surround their body with a mantle.
D. move with a muscular foot.
E. have an open circulatory system
B
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Imagine that a person breathes in a potentially pathogenic bacterium. What defenses will the bacterium encounter as it travels through the human body? Select all correct choices
A. cilia in the nasal cavity B. mucus in the lungs (if the bacterium enters the respiratory tract) C. digestive enzymes in the stomach (if the bacterium enters the gastrointestinal tract) D. phagocytes (if the bacterium enters the bloodstream)
When a moss spore lands in a suitable spot, it germinates and grows into a filament
of cells called a: a. seta. b. archegonia. c. megaspore. d. protonema. e. prothallus
In the endosymbiosis theory, what benefit did the host cell receive from the symbiont?
a. protection b. immune response c. energy d. cytoskeletal elements
The lancefield classification system for streptococci is based on
A. P protein B. M carbohydrate C. C carbohydrate D. M protein