The answer is D. Telegraph, telephone, cordless phone , mobile
Phase change is the change in state. i.e. water to steam or ice to water
The inorganic compound is KH2PO4. Organic compounds must contain carbon and hydrogen in them to be chemically classified as organic.
D
Explanation:
With the help T cells , B cells make special proteins called antibodies which stick to antigens on surface of germs stopping them in their track.
