Because you cannot test it or observe it.
A scientific theory are created through the scientific method, in the scientific method you need to be able observe it and experiment.
Answer:
Option B
Explanation:
An economics footprint can be described as a measure of biological productivity.
Ecological footprints show a comparison of the rapidness of our resources consumption and waste generation to the rapidness of natural absorbing these wastes and also including our carbon emission.
Thus, one of the characteristics of ecological footprints is a measure of our biological productivity.
A number of forces can cause gene mutations, such as smoking, radiation, viruses, cancer-causing chemicals (carcinogens), obesity, hormones, chronic inflammation and a lack of exercise.
Explanation:
c.conduct heat and electricity well
