Give two examples of the following elements in human ecosystem

a Natural Environment

b Human Constructed Environment

c Human Behavioral Environment

"water, air, sunlight, soil, plants, microorganisms, insects and animals. Ecosystems may be terrestrial - that is, on land - or aquatic. Sizes of ecosystems vary; they could entail a small puddle or an enormous swath of desert. Likewise, natural ecosystems can look quite different from one another."