Q: An element symbol without a charge written next to it is assumed to be what? A:

OPTIONS:
- dead atom
- corroborate atom
- surfactants atom
- uncharged atom

Answer: uncharged atom

Problem: OPTIONS:
- algae
- pollen
- viruses
- bacteria
Q: Q: The nitrogen that enters living systems by nitrogen fixation is successively converted from organic nitrogen back into nitrogen gas by what? A:
Answer: bacteria

Problem:OPTIONS:
- vibrate
- pull
- expand
- contract

Q: Skeletal muscles must work in pairs to move bones back and forth at a joint because they can only do what? A:
****
A: contract

Q: When fuel is burned, most of the energy is released in what form? A:
OPTIONS:
- precipitation
- carbon dioxide
- humidity
- heat
heat

Q: What takes place at some coastlines or along the equator and brings cool, nutrient-rich water to the surface? A:
OPTIONS:
- high tide
- red tide
- flooding
- upwelling

Answer: upwelling

input with options: Q: Insulin is made up of how many polypeptide chains? A:
OPTIONS:
- three
- four
- twelve
- two
output:
two