He in the passage means
D. a volunteer
The passage describes a person involved in various activities related to environmental research and exploration, which are activities a volunteer would participate in.
What did the volunteers do in the Pacific Ocean?
A. They studied whales.
The passage clearly mentions that the volunteers were looking for whales, photographing them, counting them, and recording their songs.
What exactly did they do?
C. They took photographs of whales.
The passage specifies that they "photographed the whales," which is a key activity described.
What did they do in the evenings?
D. They put all the data into the computer.
In the evening, they were working with the data, entering it into the computer as stated in the passage.
What sort of people does the organization want to find?
B. It wants to find ordinary people as volunteers.
The passage highlights that the organization recruits "ordinary people" of all kinds, including both males and females, of different ages and professions.