A- Demand for fresh produce all year round.
This illustrates that the two animals (the horse and the lion) do not eat the same type of food. This could also show one way of classification between different animal species.
Explanation:
Radioactive dating works on the principle that a radioactive isotope can decay into the stable daughter nuclei at a constant rate. Geologist generally use the principle for half life. Half life is the time required for half of the radioactive substance to decay. This is constant for a particular element.
Answer is A.cell membranes
