State TWO reasons how bacteria can be useful to humans,
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Creating products, such as ethanol and enzymes.

Making drugs, such as antibiotics and vaccines.

Making biogas, such as methane.

Cleaning up oil spills and toxic wastes. Bacteria have long been used by humans to create food products such as cheese, yoghurt, pickles, soy sauce and vinegar. We are also able to use bacteria to break down our sewage and to clean up oil spills.

Explanation:

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.

this is more of a statement than a question. is there answers to go along with this, or is it opinion based?