As I walked by the store the lady gave me a sample
B, because nothing in this talks about dogs, and the main idea of the article is fish. It is more specifically about setting up a fish aquarium.
Meaning of experiment is A-controlled observation.
Part A: D
Part B: A
Answer:
D. used and understood in other words.
Explanation:
Example: pre.
Precooked.
Prefix.
Precipitation.
Portable parts of words are suffixes and prefixes.