All organisms contain dna, and every organism's dna is made of the same four nucleotides. the differences between organisms is simply based on the order of these nucleotides. since all organisms have the same basic, universal structure for dna, which of these must also be universal? a) all organisms have the same proteins. b) all living things must have the same amount of dna. c) all organisms must be genetically identical to each other. d) all codons in all organisms' dna code for the same amino acids.

Answer;

All codons in all organisms' DNA code for the same amino acids.

Explanation;

The genetic code is universal such that almost all organisms translate nucleotide sequences of DNA and RNA to amino acids sequences of proteins.

A good example is between Humans and bacteria; A codon with three Thyamine (DNA) ; TTT ,codes for amino acid Phenylalanine.

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white blood cells or wbc s are mainly 2 types-

1.agranulocytes

2.granulocytes

the monocytes or macrophages of agranulocytes , dendritic cells which are accessory leucocytes, and b cells which is one type of lymphocytes   identify the antigens present on the pathogen's surface. these three cells are called antigen presenting cells(apc) which are phagocytes and destroy the antigens by secreting antitoxins. besides this leukocyte is always plays vital role in the immunity of the body.