Elephantiasis is caused by damage of valves that affect the flow of:
a. intestinal contents
b. lymph
c. blood
d. urine
e. cerebrospinal fluid
b
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Mussels and sponges sometimes contain methanotrophs as intracellular symbionts because the methanotrophs
A. allow the partnership to use hydrogen sulfide as a source of electrons. B. remove otherwise toxic levels of methane from the environment. C. convert methane to carbohydrate for use by the host. D. All of the choices are correct.
Vestimentiferan worms lack digestive tissues
Indicate whether the statement is true or false
____ is a systemic infection associated with microorganisms multiplying in circulating blood
Fill in the blank(s) with the appropriate word(s).
A cell that lacks the ability to make DNA repair enzymes will
A) be unable to replicate its DNA. B) replicate its DNA as rapidly as a normal cell, but the resulting DNA will have more errors in it. C) replicate its DNA as well as a cell with intact repair enzymes. D) be able to correctly replicate its DNA, but it will need more time to do so.