# Earth Science

posted by
**Anonymous**
.

2. To make observations, an observer must always use

(1)experiments

(2)the senses

(3)proportion

(4)mathematical calculations

Is it (2)?

posted by
**Anonymous**
.

2. To make observations, an observer must always use

(1)experiments

(2)the senses

(3)proportion

(4)mathematical calculations

Is it (2)?