Question

define depression...........
please.........​

Answer 1

Depression is a mood disorder that causes a persistent feeling of sadness and loss of interest. Also called major depressive disorder or clinical depression, it affects how you feel, think and behave and can lead to a variety of emotional and physical problems.

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Answer 2

Explanation:

(a) Catenation: Carbon has the unique ability to form bonds with other atoms of carbon, giving rise to large molecules. This property is called catenation. (b) Tetravalency: Carbon has a valency of four, so it is capable of bonding with four other atoms of carbon or atoms of some other monovalent element.