Answer:
Hydrogen
Explanation:
Hydrogen is the only nonmetal in group 1, therefore it is the only element in group 1 that forms a covalent bond.
These are spores, which are produced by bacteria and are involved in survival or reproduction. Some different types include endospores, which are heat-resistant spores formed within the cell, cysts, which are dormant cells sometimes enclosed in a sheath, arthrospores, which are produced by different bacteria as part their reproductive cycles and myxospores, which are formed within a fruiting body.
Answer:
The answer is Physical. Physical immunity occurs when a person immune system responds to antigen.
Explanation:
This would be enzymes made of proteins.
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