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)
Answer:
Explained
Explanation:
The first thing that the etiologist can do is try and culture bacteria from the tissue samples in the lab. And then study about the bacterium's properties and characterstics that are leading to causing diseases in the humans.
The placenta and the umbilical cord