Rods are to ____ as cones are to ____.
a. the periphery; the fovea
b. red; blue
c. vertebrates; invertebrates
d. reading text; reading road signs
Question 2
Why is the Aplysia such a popular animal for single-cell studies of learning?
a. Aplysia have neurons that are virtually identical from one individual to another.
b. Aplysia have greater learning abilities than other invertebrates.
c. Aplysia have short-term learning but not long-term learning.
d. Aplysia have only two neurotransmitters, one excitatory and one inhibitory.
The blow of a blue whale
The sparse plasma (blue) and dust (white) in the tail of comet Hale–Bopp are being
Great Blue Hole of Belize
Eosin Methylene Blue (EMB)
American soldiers—some of them regulars in deep blue uniforms, others in buckskin cowboy outfits— fi