The skin gills of sea stars are structures

(a) for the exchange of gases and excretion of ammonia.
(b) of defense.
(c) for movement.
(d) that produce the skeletal elements.


(a) for the exchange of gases and excretion of ammonia.

Biology & Microbiology

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Biology & Microbiology

Inthe dark, when rhodopsin is ____, rods ____ glutamate

a. active; release b. inactive; inhibit release of c. active; inhibit release of d. inactive; release e. inactive; inhibit synthesis of

Biology & Microbiology

If you are not satisfied with your physician, ________

A) your insurance company requires you to stay with him or her B) it is too late to find a new one because you signed a contract C) you are allowed to find another one who better suits your needs D) you should go to the ER with every symptom

Biology & Microbiology

RNA is thought to be the original polymer because it can ________ like proteins and ________ like DNA.

A. catalyze reactions, self replicate B. store information; catalyze reactions C. catalyze reactions; store information D. self replicate; catalyze reactions

Biology & Microbiology