The environment the body was left in
A closed system is a system that makes no physical or chemical exchanges with its environment. Of these systems provided as choices (tree, human, clock, car), only a clock does not make exchanges with the environment, except for energy.
Therefore, of that list, only a clock would be a closed system.
Hope that helped! =)
C. a green parrot has an allele for green feathers and an allele for blue feathers.
By all plants, algae, and some microorganisms
