Answer:
breakdown of a substance by bacteria, yeasts, or other microorganisms
Explanation:

<em><u>One of the best ways to determine if a tree or any plant is dead is the tree scratch test. Just beneath the dry, outer layer of bark in a tree's trunk lies the cambium layer of bark. In a living tree, this is green; in a dead tree, it is brown and dry</u></em>
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Formation of ions: 1
Formation of crystals: 4
Formation of ionic bonds: 2
Formation of cubes: 3
Hope this helps :)
an organelle that releases energy for metabolic activity in a nerve cell is the what
the mitochondria
Deforestation. The animals forest that they once lived in are bein cut down.