PLEASE HELP WITH Borge of the questions I will mark you brainliest if you give it in complete sentences

Which are forms of nitrogen that are usable by humans

Which of the following is not a possible effectof increasimg carbon dioxide levels in the atmosphere ?

The hardy-weinberg principle is that genetic frequencies in a population? will remain stable from generation to generation will always be changing will not be affected by environmental changes are always in a 3: 1 ratio