Answer:
a one-celled, microscopic organism belonging to any of several families of rhizopods that move and feed using pseudopodia and reproduce by fission; esp., any of a genus (Amoeba) found in soil or water or a parasitic genus (Entamoeba) found in higher animals and humans.
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My answer would be radiation.
Trees help the environment, they make oxygen from carbon dioxide. We should plant more because we are constantly chopping down trees to get wood, and planting more helps to ensure that will we will have trees in the future.
I believe that the loop of Henle is the hairpin structure that connects the proximal and distal convoluted tubules. The loop of Henle is composed of the ascending and the descending limb. The descending loop of Henle connects the proximal convoluted tube with the ascending limb of the loop of Henle, while the ascending loop of Henle connects the descending limb of the loop of Henle with the distal convoluted tubule.
A subset of MHC molecules known as Class II of the Major Histocompatibility Complex (MHC) is often only found on specific antigen-presenting cells such as dendritic cells, mononuclear phagocytes, specific endothelium cells, thymic epithelial cells, and B cells.
<h3>Do macrophages contain MHC 2?</h3>
In order to deliver Listeria monocytogenes to T cells for phagocytic processing, class II MHC molecules are found in macrophage lysosomes and phagolysosomes.
<h3>Are macrophages MHC-positive?</h3>
Exogenous antigens can be processed by macrophages and displayed on MHC molecules.
<h3>Which cells possess MHC 1 vs. 2?</h3>
All nucleated cells contain MHC I glycoproteins. Specialized antigen-presenting cells are the only ones to contain lls.
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