Explanation - A substance have both physical and chemical properties that defines their state and ability to react with substances. Physical properties are those properties that provides the information about the substance but does not change its composition whereas chemical properties are those properties that are seen while the chemical reaction is taking place and the composition of the substance also changes.
Few examples of chemical properties are - toxicity, heat of combustion etc and that of physical properties are - color, density, odor, meting and boiling point etc.
Environmental factors do influence natural selection because they can increase or decrease the population of a species, by selecting those with only favorable traits.
As I know, the effects of human activities on biogeochemical cycling are <span>examples of an ecological study involves the ecosystem level of organization.</span>
