Answer:
Touching, Smelling.
Explanation:
Touching will be useful to detect stimuli like coldness and hotness.
Smelling on the other hand will help to make observations on smell and change in smell. These two are among the five senses that we use to make observations as we record what we see, hear, touch and feel, smell and taste.
A hypothesis is a likely explanation of a phenomenon or an observation. Scientists design careful experiments in order to validate the hypothesis. ... In general, it is much easier to disprove a hypothesis than prove it. Any number... A hypothesis is a likely explanation of a phenomenon or an observation
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Answer: layer c is oldest but I can see all of the options
Explanation: