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When the sun disappears below the horizon in the evening.

The square root of a number is a value that, when multiplied by itself, gives the number.

An embryonic plant enclosed in a protective outer covering.

The flexible outer tissue covering the body of a vertebrate animal, with three main functions: protection, regulation, and sensation.

Hard solid non-metallic mineral matter of which rock is made.

Small in length, distance, or height.

When the sun appears from below the horizon in the morning.

A measure of how dispersed the data is in relation to the mean.

A fluid produced by the seminal vesicle to contain sperm.