It is a theory because there is no evidence that supports the scientists theory
C
As the cap helps it to move around while the tail prevents enzymes from eating the RNA
properties of gases
it has definite mass
indefinite shape
indefinite volume
so here we can say that gas have indefinite volume not definite so therefore the answer will be A
A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment. So it’s the last one.