Problem:OPTIONS:
- platelete
- hydrogen
- plasma
- hemoglobin

Q: Most oxygen in blood is bound to a protein called what, and carried to the tissues?   A:
****
A: hemoglobin
Q: The three stages of transcription are initiation, elongation, and what?   A:
OPTIONS:
- prolongation
- separation
- degradation
- termination
termination
Q: What corrosive substances capable of dissolving many metals can cause contamination if spilled?   A:
OPTIONS:
- salts
- bases
- ions
- acids

Answer: acids
Question: Q: Structures that have lost their use through evolution are called _______   A:
OPTIONS:
- primordial structures
- residual structures
- symbiotic structures
- vestigial structures
Answer: vestigial structures
input with options: Q: What kind of biome or climate might you find very close to the earth's poles, as well as up on high mountains?   A:
OPTIONS:
- tropical
- desert
- taiga
- tundra
output: tundra
Problem: OPTIONS:
- complement
- Invasive
- Leader
- keystone
Q: Q: What is a species that plays an especially important role in it's community called?   A:
Answer:
keystone