A biological system is a complex network of biologically relevant entities. ... Examples of biological systems at the macro scale are populations of organisms. On the organ and tissue scale in mammals and other animals, examples include the circulatory system, the respiratory system, and the nervous system. source: google
The federal government regulates and controls the economy through numerous laws affecting economic activity.
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Answer:
overreacts to an antigen
Explanation:
Allergies to substances are as a result of immunological dysfunction.
Answer:
A
Explanation:
I think its A but it can also be made to condense into a liquid