How many amino acid hormones what are

Amino Acid Derivatives

There are two groups of hormones derived from the amino acid tyrosine: Thyroid hormones are basically a "double" tyrosine with the critical incorporation of 3 or 4 iodine atoms. Catecholamines include epinephrine and norepinephrine, which are used as both hormones and neurotransmitter

b. lithosphere, asthenosphere, mesosphere   is the answer most likely

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.