What is the primary determinant of how far an agent travels into the respiratory tract?
a. size of the agent
b. immune status of the host
c. amount of mucus
d. depth of breathing
e category of organism
a. size of the agent
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Endosperm is usually triploid. Indicate whether the statement is true or false
From personal experience, you may have noticed that cut flowers placed in a vase with tap water continue to be "alive" for several days. What is the most likely explanation as to why these cut flowers don't immediately wither and die?
A. The tap water in the vase is an excellent source of nitrogen. B. The plant can still take up water from the vase via an "evaporative pump." C. Cells in the flower petals continue to carry out photosynthesis. D. Cavitation allows for water to still be transported through the flower stems.
Where are a mollusk’s gills located?
a. within the visceral mass b. under the foot c. in the mantle cavity d. surrounding the radula
Jellyfishes are
a. polyp forms of cnidarians. b. medusae forms of cnidarians. c. spongiforms of cnidarians. d. spongiforms of echinoderms. e. polyp forms of echinoderms