Question

¿Qué es la tristeza?

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Answer 1

• Feeling down or unhappy in response to grief, discouragement or disappointment; if ongoing, may indicate depression.

COMMON CAUSES

• Sadness can be normal, and is only an indicator of underlying disease when feelings become excessive, all-consuming and interfere with daily living.

Why sad :(

Answer 2

Explanation:

Explanation:In biology, the smallest unit that can live on its own and that makes up all living organisms and the tissues of the body. A cell has three main parts: the cell membrane, the nucleus, and the cytoplasm. ... Parts of a cell. A cell is surrounded by a membrane, which has receptors on the surface.