Answer: A. The first section establishes pesticide toxicity; then, the second section analyzes problematic factors with its use.
Explanation:
EDGE2021
Instead!
The word instead implies that what was said before or after (depending on context) does not apply to something. For example:
“Instead of washing the dishes, I did the laundry...” means that someone did laundry instead of washing the dishes. Instead of connecting ideas, it separates them!