You can use one or more of your five senses to make during an inquiry activity. is it an observation?

You can use one or more of your five senses to make observation during an inquiry activity.  

Explanation:

Each sense organ is adapted to respond to a given stimulus and has sensory receptors capable of transforming these stimuli into nerve impulses. The use of these senses (the 5 or less) allows us to conclude about numerous factors outside our body and allows us to make several observations and inferences.

For this reason, we can say that you can use one or more of your five senses to make observation during an inquiry activity.

the answer to your question is tooth decay.