Question

When scientists use one of their five senses to gather information, they are?

Answer 1

Hmmmm. If they use one, <b>it</b> is ...

This is a very odd question. Scientists use observation and research to gather information.

Answer 2

I would also say: they are observing.

usually that word is reserved for sight, but there's no reason any other sense could not be used to observe.

Answer 3

observing

Answer 4

gather data through observation