Question

please answer my questions​

Answer 1

Answer:

ans.4

Explanation:

A spectrum (plural spectra or spectrums) is a condition that is not limited to a specific set of values but can vary, without steps, across a continuum. The word was first used scientifically in optics to describe the rainbow of colors in visible light after passing through a prism.

Answer 2

Answer:

pituitary gland

Reflection loss

Explanation:

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