3. living systems consist of organisms interacting with their environments. the carbon cycle is an example of a living system. assuming the carbon cycle is a closed system, which of the following statements is true?

Mass and energy are conserved in the carbon cycle.

answer: land bridge theory. land bridge theory held that shifting portions of dry land explained the finding of identical species on different continents. plate tectonic theory eventually eliminated the land bridge theory.

not sure if this is what you'r looking for nnew= nold