Of the following processes in nature, which one involves only a physical change? a. a bird digests a worm. b. photosynthesis occurs in a leaf. c. an earthquake causes a rockslide. d. a chunk of iron ore rusts.

c

Explanation:

I think because it's not doing any chemical reaction

C. An earthquake causes a rockslide.

Explanation:

A physical change is the type of change which does not change the chemical properties of the substance. If an earthquake causes a rockslide in this case the chemical property of the rock still remains the same so it will be a physical change.

All other options are chemical changes because the chemical properties of the substrates will be changed after the completion of process.

When a bird will digest a worm, the proteins of the worm will be broken down into amino acids which will further be converted into energy molecules known as ATP.

During photosynthesis inorganic carbon dioxide & water will be converted into organic bio-molecule known as glucose, the properties of glucose are entirely different from carbon dioxide & water.

Rusting is a chemical process because during rusting iron which is a metal is converted into inorganic molecule iron oxide and the chemical properties of iron oxide are entirely different from iron.

from my research i have to the conclusion that decomposers, such as fungi, bacteria and invertebrates, play a critical role in nutrient cycling and without them the earth's ecosystem may not support life as we know it. elements such as carbon, nitrogen and phosphorus exist in limited amounts on earth, although huge amounts of carbon are being released into the atmosphere from underground sources now by humans. it is still extremely important that other nutrients be retained by the process of re-use. decomposers are organisms that are able to chemically break down dead material and make these elements available for use by other organisms. without this breakdown of dead material, dead bodies would pile up. so decomposers also play a role in clean up also. without them, life might not continue as we know it and dead material would overwhelm the earth.    

easy

explanation: