<h2>Answer</h2><h3>A. Kingdom, phylum, class, order</h3><h2>Explanation:</h2>
The taxonomic groups are basically used in the scientific classification from most general to most specific. There are seven main taxonomic levels such as kingdom, phylum or division, class, order, family, genus, species. The most specific classification is genus and species. The broadest classifications are by domain and kingdom.
The adaptive (specific) defense system: issues an attack specific to particular foreign substances. hence, option A is correct.
<h3>What is the adaptive immune system's primary function?</h3>
Adaptive immune responses are designed to eliminate invading infections and any harmful chemicals they create. Because these responses are harmful, they must only be elicited in response to molecules that are foreign to the host, not the host's own molecules.
Antibodies and lymphocytes make up the adaptive defense, which is also known as the humoral and cell-mediated responses. The term 'adaptive' alludes to the distinction between self and non-self, as well as the tailoring of a response to a specific foreign invader.
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The carbon cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth.
The answer is the option B. Nucleotide. Nucleotides are organic molecules formed by three units :one or more phosphate groups, a sugar with five carbons (ribose or deoxyribose) and a nitrogenous base. Nucleotids are the units that form the two nucleic acid polymers: DNA and the RNA.