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Retinology is a field within ophthalmology for treating diseases and injuries of the Retina (part of the eye).

 

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The Retina is the cell layer in the eye (in the back part of the eye ball) which contains the light sensitive cells and neurons for photoreception.

 

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Ribonucleic acid. Used in transcription of DNA and it is the primary genetic material in some viruses. RNA is a large molecule consisting of a single strand chain of ribonucleotide subunits with 4 bases, uracil (U), guanine (G), cytosine (C) and adenine (A). It is found in cell as transfer RNA, ribosomal RNA and messenger RNA. 
The voluntary flow of stomach content back into the mouth of the donor and from there into the mouth of the receiver. Found in many animals that show parental care towards their offspring mainly in birds, but also in insects and social spiders.