The atmosphere contains about 80% nitrogen gas, but nitrogen in this form cannot be used by plants. which of the following processes converts atmospheric nitrogen to a useful form for plants?
a nitrogen decomposition b nitrogen fixation
c photosynthesis
d transpiration

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

answer:

sequence 1- deletion

                  2- duplication

                  3- insertion

                  4- substitute

                  5- inversion

ans.

gregor john mendel is known for study of inheritance in pea plants. he used garden pea plant for his study, having alternative traits for various characters. he performed cross-breeding in pea plants to check how characters are transmitted between parents to offspring, such as cross between pure tall and pure dwarf plant. mendel studied the inheritance patterns in pea plants for various generations.

thus, the correct answer includes options and f).