The correct answer is endothelium.
The endothelium is a thin layer of single-layered, squamous cells that can be found in the lumen of blood vessels, on the interior surfaces of the heart chambers, in the glomerulus of the kidney...The main function of endothelium is barrier function when it acts as a semi-selective barrier between the lumen of the vessels and surrounding tissue, and thus, controls the passage of materials. The endothelium is also included in functions such as fluid filtration in the kidneys, the control of blood pressure (vasodilatation and vasoconstriction), inflammation.
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A specific animal is A. species
Fahrenholz's rule is supported when: comparison of phylogenies for host and parasite show a correlated pattern of evolution
<h3>What is Fahrenholz's rule ?</h3>
The close correspondence is observed between the taxonomy of parasites and their hosts and this has led to Fahrenholz's rule. This rule postulates that parasites and the hosts speciate in synchrony.
This leads to a prediction that phylogenetic trees of parasites and their hosts are topologically identical.
when the only events in the process of reciprocal natural selection in the host and parasite lineages were those of contemporaneous speciation in both the lineages then host and parasite phylogenies are fully congruent, hence supporting Fahrenholz'srule.
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