Q: What system is the brain the control center of? Choices: - adrenal - fibrous - circulatory - nervous A:
nervous

Q: Ionic, covalent, and hydrogen are three important types of what type of interaction between different types of atoms? Choices: - forms - conflicts - levels - bonds A:
bonds

Q: Q: What to tadpoles develop into? Choices: - toads - mosquitos - snakes - frogs A:
A: frogs

Question: Q: What substance can be identified by their atomic number and mass number? Choices: - structures - compounds - solutions - elements A:
Answer: elements

*Question*
Q: Bacteria can be used to make cheese from milk. the bacteria turn the milk sugars into what? Choices: - acetic acid - ionic acid - hydrochloric acid - lactic acid A:
**Answer**
lactic acid

*Question*
Q: Not getting enough calcium may cause what health problem? Choices: - blindness - arthritis - diabetes - osteoporosis A:
**Answer**
osteoporosis