Amines are organic compound obtained from ammonia by replacement of one or more hydrogen atoms by organic groups. If one of the 'H' atom of NH3 is replace by R = alkyl group, they are referred as primary amine. If two 'H' atoms of NH3 are replace by same or different alkyl group, they are referred as secondary amine.
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Hello there.
<span>3. atom
</span>found in molecules
Hi Alex, thanks for asking a question here on Brainly!
We can figure how the fast the person is running by dividing the minutes by the seconds.

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The person was running 18 km/hr. ✅
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Answer:
Matter is the term for any type of material. Matter is anything that has mass and takes up space. At a minimum, matter requires at least one subatomic particle, although most matter consists of atoms.
Some examples are: Water, books, pencils, sun, earth, moon, electron, proton, mesons, and quarks