A packet of light energy is called a
A) quantum.
B) pigment.
C) photon.
D) phaser.
Answer: C
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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.
The cerebrum is part of the _____
a. forebrain c. hindbrain b. midbrain d. brain stem
When a blood vessel gets damaged, contractions of smooth muscle referred to as ________ help constrict the vessel to reduce blood flow
A) vascular spasms B) hemostasis C) homeostasis D) formed elements E) endocytosis
Lungs first evolved in which group?
a. cartilaginous fishes b. bony fishes c. lampreys d. coelacanths e. lungfishes