Biological method involves all the following except (a) data collection (b) observation (c) proportion (d) experiment​

c. proportion.

Explanation:

everything else is a part of the method.

cats appear to have glowing cat eyes because the back of their eyeballs includes a special reflective surface called the tapetum lucidum. this lets them see better during the night, giving them a much better vision.

the denominator has a very specific role.