Question

What is trap? what are various trap use in plumbing?

Answer 1

In plumbing, a trap is a device which has a shape that uses a bending path to capture water to prevent sewer gases from entering buildings, while allowing waste to pass through.
In refinery applications, traps are used to prevent hydrocarbons and other dangerous gases from escaping outside through drains.

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Answer 2

Answer:

Transcription is the first of several steps of DNA based gene expression in which a particular segment of DNA is copied into RNA by the enzyme RNA polymerase. Both DNA and RNA are nucleic acids, which use base pairs of nucleotides as a complementary language. Wikipedia