Answer: Option B
Explanation:
First is the tool used by the second.
Answer: Option C
Ecology deals with the study of environment.
Similarly, Histology deals with the study of tissues.
Answer: Option A
Second is required for the working of the first.
The word in each pair are antonyms of each other.
Answer: Option D
Hooks discovered the cells.
Similarly, Mulder discovered the proteins.
Second is the load carried by the first.
First is the young one of the second.
Mathematics is the theory of numbers and
History is the theory of past events.
Sirius is a star and Cygnus is a constellation.
The words in each pair are antonyms of each other.
