Question

when making an observation, you must use... only sight smell & touch only taste all 5 senses

Explanation:

In scientific observation, using all five senses (sight, hearing, touch, smell, taste) can provide a more comprehensive understanding. While sometimes only one or a few senses are applicable depending on the object of observation, in general, using all 5 senses is ideal to gather as much information as possible.

Answer:

ALL 5 Senses