The pH scale measures how basic or acidic a substance is, and it ranges from 0 to 14. On the pH scale, a pH of 7 is neutral, less than 7 is acidic and higher than 7 is basic.
1.Artificial
c.blood and cells
c.presence or absence of a particular plasma
The answer is C and D.
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Answer:
overreacts to an antigen
Explanation:
Allergies to substances are as a result of immunological dysfunction.
