Why are bacteria a necessary part of the nitrogen cycle?​

Bacteria converts ammonia into nitrate and nitrite, they produce chemicals that the plants eat to prevent the bacteria from dying.

Explanation:

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i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!