Problem: OPTIONS:
- toxic
- natural
- artificial
- chemical
Q: Q: What type of weathering causes the minerals in a rock to change? A:
Answer: chemical

Problem:OPTIONS:
- neutrality
- hydrogeny
- oxidation
- ph

Q: What is described by the concentration of hydrogen ions in a solution? A:
****
A: ph

Q: What is the basic unit of structure and function in all organisms? A:
OPTIONS:
- the atom
- the neutron
- the electron
- the cell
the cell

Q: Plants obtain the molecules for cellular function though what? A:
OPTIONS:
- tissues
- nutrients
- Plants
- photosynthesis

Answer: photosynthesis

Question: Q: What occurs when the immune system makes an inflammatory response to a harmless antigen? A:
OPTIONS:
- antibodies
- asthma attack
- immunity
- allergies
Answer: allergies

input: OPTIONS:
- gaseous reaction
- acid reaction
- balanced reaction
- chemical reaction Now, answer this question: Q: In which type of reaction are compounds formed? A:
A:
output:
chemical reaction