Answer;
Genes
The code for heredity is carried on genes in each organism's DNA.
Explanation;
Genes are portions of the genome that codes for a protein or an RNA, Hereditary information that is contained in nucleotide sequence of DNA. The coded information is copied into RNA (through transcription process) and translated into chains of amino acids which eventually link together to make proteins. The hereditary information is passed from one generation to another.
Answer: The number of electrons in an atom's outermost valence shell governs its bonding behaviour. Elements whose atoms have the same number of valence electrons are grouped together in the Periodic Table. ... Nonmetals tend to attract additional valence electrons to form either ionic or covalent bonds.
The answer is D; homeostasis allows the maintenance and regulation of stability and constancy that is needed to properly function. It is found in cells, tissues and organisms,