1.) The process the statement is describing is called distillation. The correct answer is B.
2.) The process of fractionation is based on boiling points. The correct answer is B.
3.) Crude oil is separated into different substances such as gasoline, petroleum, diesel fuel, and propane by fractionation. The correct answer is B.
4.) The process that is used to separate the chemical from a blood or urine sample is called chromatography. The correct answer is D.
5.)Osmosis involves separating a solution by moving liquids across a selectively permeable membrane. The correct answer is B.
Answer:
Should I just fill it out?
Explanation:
Ans.
Different barriers present in the body prevent entry of disease causing agents or pathogens from entering into body and provide protection against them. These barriers include various physical, chemical, and biological barriers.
Physical barrier include skin and coughing and sneezing. Skin provides first line of defense by preventing entry of pathogens, and coughing and sneezing that expels harmful agents out of the body.
Chemical barriers include lysozyme, acids, and oil secretion. Lysozyme is an enzyme that kills bacteria by targeting their cell wall, while oil and acid prevent microbial growth by providing non-favorable environment for them.
Biological barriers include phagocytes and Langerhans cells. Phagocytes are immune cells that engulf and destroy pathogens and Langerhans cells are antigen-presenting cells that help in elimination of pathogens.
Answer:
Explanation:
Cells are considered the basic units of life in part because they come in discrete and easily recognizable packages. That's because all cells are surrounded by a structure called the cell membrane — which, much like the walls of a house, serves as a clear boundary between the cell's internal and external environments.
