A newly hatched animal which has not developed all its body parts is a

A newly hatched animal which has not developed all its body parts is  a Nymph.

A nymph is the immature form of some invertebrates, particularly insects, which undergoes gradual metamorphosis before reaching its adult stage.  A group of mammals that lay eggs and their young are hatchlings as well known as monotremes. Fish, amphibian, reptile, or bird are hatched in oviparous biology.

carbohydrates: (starches and sugars) composed of carbon, hydrogen, and oxygen.

lipids: (fats, oils, and waxes) are made of carbon and hydrogen atoms.

nucleic acids: contain hydrogen, oxygen, nitrogen, carbon, and phosphorus. they are polymers of nucleotides. a nucleotide has three parts, a 5-carbon sugar, a phosphate     (-po⬇️4) group, and a nitrogenous base.

proteins: made up of nitrogen, carbon, hydrogen, and oxygen. they are polymers of amino acids.