Answer:
3. An Apple Turning Brown
Explanation:
When an apple is cut (or bruised), oxygen is introduced into the injured plant tissue. When oxygen is present in cells, polyphenol oxidase (PPO) enzymes in the chloroplasts rapidly oxidize phenolic compounds naturally present in the apple tissues to o-quinones, colorless precursors to brown-colored secondary products.
So natural reasources are organic elements formed to make a substance
1)water
2)gold
3)copper
4)platinum
5)coal
The answer is option A "habitat." A habitat is a place where animals live. Ecosystem is a bunch of habitats together for example land, desert, or sea. Habitats are things such as trees, ponds, rocks, etc....
Hope this helps.
