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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: True
HIV infects a type of white blood cell in the body's immune system called a T-helper cell (also called a CD4 cell). These vital cells keep us healthy by fighting off infections and diseases. HIV cannot reproduce on its own. Instead, the virus attaches itself to a T-helper cell and fuses with it (joins together).
Explanation:
T-cells, the thymus cells, work in a similar way but destroy infected cells rather than manufacture antibodies. In HIV infection, the body mounts a very strong antibody response in the first few weeks that partially works, bringing the viral load down from millions to, on average, about 50,000 copies/ml.
The legs, wings, or fins most of the time are used in locomotion and sometimes in defense.
These are two functions of an animal's movement structures like wings, legs, or fins:
- migrating to mating spots
These structures are like structural adaptation defenses. These structures might be for defense, movement and for obtaining resources which might include food.
Learn more about these structural adaptations: brainly.com/question/352589
