Cell
Tissue
Organ
Organ System
Organism
The answer is B. they embody the idea of descent with modification.
The answer would be respiratory because that system is used to breath oxygen and exhale carbon
<span>Tertiary</span> structure - three-dimentional structure of one polypetide chain.
Proteins are considered as for their conformation in four different stages:
Primary structure is referred solely to the sequence of amino acids<span> in the polypeptide chain.
</span>Secondary structure is the immediate basic folding of a protein and it can be α-helix and β-sheets.
Tertiary structure is the three-dimentional folding of a singles polypetide.
Quaternary structure is the thee-dimenional structure that results from the combination of two or more individual polypetides working as single protein.
A dependent variable is a value that depends on another, so what relies on the other! :)