Answer:
A. Uses the law of superposition to determine which rock is older or younger.
Explanation:
I majored in Biology
Answer:
Independent Variable: Give one group the drug and dont give the other group the drug
Dependent Variable:The data of if the drug improves the rats memory(if their memory is better, the same, or made worse)
the causes of most of them are unknown. Some birth defects are considered to be physical, while others are thought of as functional. Physical birth defects result in the malformation.