Which one of the following is the structure of the eye that serves to focus light on the retina?
A. cornea
B. lens
C. sclera
D. pupil
B
You might also like to view...
Molecules made primarily of carbon and hydrogen are called hydrocarbons. In each of the following hydrocarbons, indicate how many hydrogen atoms are present: 12, 10, 8, or 6
A chain of five carbons joined to each other by single covalent bonds A chain of five carbon atoms with one double bond and the rest single bonds A chain of five carbon atoms with two double bonds and two single bonds A five-carbon molecule with four of the carbons linked by a single covalent bond, and with the fifth carbon attached by a single bond as a branch to the second carbon in the chain A ring of six carbon atoms held together by alternating single and double bonds
A farmer is concerned that if she plants seeds for her next harvest, many of them will remain dormant and fail to grow. Depending on the plant, what steps can the farmer take to ensure that many of her seeds will germinate?
A. She can treat her seeds with red light prior to planting. B. She can put her seeds in the refrigerator for a few months before planting. C. She can rub her seeds with sand paper prior to planting. D. She can feed the seeds to her cows and collect them after they have passed through the animals' digestive tracts.
Dissolved oxygen would be expected to be highest in which of these bodies of water?
a. warm eutrophic lake b. slow-moving tropical river c. pool within a cool forest stream d. white water stretch of a cold river e. dissolved oxygen should be the same in all waters
True or false: The axon of a neuron can only communicate with other neuronal cells.
Answer the following statement true (T) or false (F)