Problem: OPTIONS:
- hormones
- carbohydrates
- iseotrops
- enzymes
Q: Q: What substances serve as catalysts in most of the biochemical reactions that take place in organisms? A:
Answer: enzymes

Problem:OPTIONS:
- polar age
- earth age
- thermal age
- ice age

Q: What do you call a period when temperatures are cooler than normal, causing glaciers to spread? A:
****
A: ice age

Q: The distance between two crests of a wave of light is referred to as what, which is related to the color of light? A:
OPTIONS:
- magnitude
- spectrum
- bandwidth
- wavelength
wavelength

Q: Difference in electric potential energy are measured in what basic unit? A:
OPTIONS:
- moles
- watts
- knots
- volts

Answer: volts

Question: Q: In a scientific experiment, the variable that is affected by the other one is called what? A:
OPTIONS:
- effective variable
- essential variable
- independent variable
- dependent variable
Answer: dependent variable

input: OPTIONS:
- soil
- root
- stem
- leaf Now, answer this question: Q: What part of the plant is the main site of photosynthesis? A:
A:
output:
leaf