Problem: OPTIONS:
- carbon
- sulfur
- base
- acid
Q: Q: What is a substance that increases the hydrogen ion concentration of a solution? A:
Answer: acid

Problem:OPTIONS:
- quantum physics
- time-space
- momentum
- mass-energy

Q: The pion can only be created by violating the conservation of what? A:
****
A: mass-energy

Q: What system consists of glands that secrete hormones into the bloodstream? A:
OPTIONS:
- Respiratory system
- nervous system
- Muscular system
- the endocrine system
the endocrine system

Q: Organs that produce eggs and secrete estrogen are part of what system? A:
OPTIONS:
- circulatory system
- digestive system
- male reproductive system
- female reproductive system

Answer: female reproductive system

Question: Q: Which acid contains only one ionizable hydrogen? A:
OPTIONS:
- citric acid
- lactic acid
- amino acid
- monoprotic acid
Answer: monoprotic acid

input: OPTIONS:
- gravity
- temperature
- energy
- time Now, answer this question: Q: Due to the time it takes for light to reach us, galaxies at the edge of the universe are distant in terms of space and what else? A:
A:
output:
time