Final answer:
The statement is a. true. Earth's cycles provide organisms with continued access to usable elements necessary for sustaining life.
Step-by-step explanation:
a. True
Earth's cycles, known as biogeochemical cycles, involve the movement of elements through the biosphere. These cycles allow for the continuous recycling and availability of essential nutrients for living organisms.
The elements and water needed by organisms are taken up from the environment, built into tissues, and eventually released back into the environment for incorporation into new life. This process ensures the sustainability of life in natural terrestrial ecosystems.