The answer is natural killer cells.
Natural killer cells are a type of lymphocytes and they are important for the innate immune system. They recognise stressed cells much faster than other immune cells. Their response is rapid and usually only a few days after a viral infection. They also respond to <span>cancer cell </span>formation. While other immune cells can detect only those harmful cells that have specific markers on the surface of the cell membrane, natural killer cells can even detect those cells that miss markers for apoptosis.
Natural selection. Have you heard of his finch studies? That will help you to understand natural selection if you need help.
This is indicative of classical conditioning as studied by Pavlov. There is an unconditioned stimuli, in this case, Kendra’s nausea wherein nausea is not often associated with alcohol. The conditioned stimuli here is the smell of liquor which does not normally associate with nausea in other humans. In this case, Kendra’s nausea is now associated with the smell of liquor; yet another possible conditioned stimuli such as the sight of bottle was not associated.<span> </span>
<span>I think the correct answer among the choices listed above is option C. The organism described most likely is a starfish. This is because annelids and mollusks exhibit spiral holoblastic cleavage while the echinoderms have radial holoblastic cleavage.</span>
