The carbon cycle makes carbon compounds continuously available in an ecosystem and delivers . A. Water to all organisms

B. Light energy to autotrophs

C. Carbon dioxide to animals within the ecosystem

D. Chemical energy to organisms within the ecosystem

Nephrons, the functional unit of kidneys, are responsible for formation of urine. the sentences describe situations that are the result of problems in the urine formation process. for the nephron shown below, match each situation to the step in the urine formation process where the problem lies.