input: OPTIONS:
- hydroceptive
- covalent
- hydroaversive
- hydrophilic Now, answer this question: Q: All lipids have two distinct domains, a hydrophobic and a what? A:
A:
output: hydrophilic

Q: What are the two types of photoreceptors in the retina? A:

OPTIONS:
- holes and cones
- circles and cones
- images and cones
- rods and cones

Answer: rods and cones

Problem: OPTIONS:
- mineral
- vitamins
- hydrogen
- energy
Q: Q: In a food chain, only about 10 percent of what passes to the next level? A:
Answer: energy

Problem:OPTIONS:
- ecological
- physical
- chemical
- biological

Q: Molds, pollen, and pet dander are examples of air pollution with what type of source? A:
****
A: biological

Q: Caffeine is an example of what type of drug? A:
OPTIONS:
- depressant
- barbiturate
- nicotine
- psychoactive
psychoactive

Q: What does the vertebral column , or backbone, protect? A:
OPTIONS:
- disks
- neurons
- axons
- spinal cord

Answer:
spinal cord