Hen there is a cut in the skin and bacteria enter the body, the immune system responds. first, macrophages approach the area of the cut. next, the macrophages surround any bacterial cells and engulf them. what feature of the immune system is best described by this scenario? a. antigen specificity, which is a part of adaptive immunity b. the phagocytotic barrier, which is a part of innate immunity c. the inflammatory barrier, which is a part of innate immunity d. self-recognition, which is a part of adaptive immunity

Correct B). The phagocytotic barrier, which is a part of innate immunity

The scenario represents the phagocytosis, which is a type of endocytosis by which the cell engulfs microbial pathogens. The main cells of the immune system that are involved in phagocytosis include macrophages, neutrophils, and dendric cells.

It is a mechanism which is used by the immune system to kill and processing of antigen that play an important role in innate immune response.

Hence, the correct answer would be option B.

water is a polar molecule. a chemical bond is a force of attraction between atoms or ions. bonds form when atoms share or transfer valence electrons. atoms form chemical bonds to achieve a full outer energy level, which is the most stable arrangement of electrons. so, false

explanation:

in h2o molecule, two water molecules are bonded by a hydrogen bond but the bond between two h - o bonds within a water molecule are covalent. the greater the electronegativity difference, the more ionic the bond is. bonds that are partly ionic are called polar covalent bonds. nonpolar covalent bonds, with equal sharing of the bond electrons, arise when the electronegativities of the two atoms are equal.