The answer is protect the body from infection by pathogens
The physical barrier is made of epithelial cells, mostly will be keratinized to increase their sturdiness further. They will impede the pathogen physically by barricading the cells, makes the pathogen could not invade deeper part of the body. Histamine and antibodies should be the role of immune cells, not epithelial.
Natural channels. Natural channels are formed by fluvial process and are found across the Earth. These are mostly formed by flowing water from the hydrological cycle, though can also be formed by other fluids such as flowing lava can form lava channels.
Answer A) Magnesium
The atomic number of magnesium is 12. The atomic mass of magnesium is 24.31 amu. The total number of electrons is 12. The symbol for the element is Mg.
Answer B) Calcium
The atomic number of magnesium is 20. The atomic mass of Calcium is 40.078 amu. The total number of electrons is 20. The symbol for the element is Ca.
Answer C) Nitrogen
The atomic number of nitrogen is 7. The atomic mass of nitrogen is 14.0067 u. The total number of electrons is 7. The symbol for the element is N.
Answer D) Carbon
The atomic number of carbon is 6. The atomic mass of carbon is 2.0107 u. The total number of electrons is 6. The symbol for the element is C.
Answer E) Mercury
The atomic number of mercury is 80. The atomic mass of nitrogen is 200.59 u. The total number of electrons is 80. The symbol of the element is Hg.
Answer F) Gallium
The atomic number of Gallium is 31. The atomic mass of Gallium is 69.723 u. The total number of electrons is 31. The symbol of the element is Ga.
Codominance is the answer good luck u got a good grade
Answer:
The density of the liquid is 0.87 g/ml
Explanation:
Density = 17.4g divides 20ml = 0.87 g/ml (rounded to one significant figure)
