<span>The correct answer is A, B and D. Biogeochemical cycles are central to the ecology of earth system. They make the essentail elements accessible and available for the organisms, and maintain their levels, so that the ecology is ot disrupted. The elements move through abiotic and biotic factors, in these cycles, and a state of equilibrium is maintained n the ecosystem. The carbon dioxide levels are responsible fr the temperature of the earth. If Carbon cycles would not have existed, then there would have been a disruption in maintaining the global temperature. Biogeochemical cycles basically continuously recycles the essential materials, for sustaining the life-forms.</span>
I only have one reason but hope it helps!
Because without those bases pairing there <span>would be no structure of a DNA.</span>
Answer:
Plant make their own food using sunlight. Hebivores eat plants for food. Omnivores eat plants and animals for food.Carnivores eat animals for food
Chromosomes are made up of two sister chromatids , and are then dispersed as chromatin which is the DNA making up the chromosome.
