What scientists would most likely engage in fieldwork to observe organisms?

The correct answer will be- A Biologist

Explanation:

Science is a branch of study which deals with studying the natural process and events.

The branch has been categorized into three categories based on the aspect a scientist is dealing with:

1. one who studies chemical compounds is known as a chemist.

2. one who studies the physical process of nature is known as a physicist.

3. one who studies living organism or bio-organism is known as a biologist.

Thus, a biologist is the correct answer.

i would say it is