(this is astronomy)
which statement about nuclear fusion is correct?

a. two hydrogen electrons become protons during fusion.

b. helium nuclei can fuse to form elements such as nitrogen.

c. the fusion reaction lasts for several hundred years.

d. large nuclei break apart to form smaller nuclei.

a. seed plant structure. 1. the three main plant organs are roots, stems, and leaves. a fourth kind of tissue, meristematic tissue, is responsible for plant growth. meristematic tissue is the only plant tissue that produces new cells by mitosis. plants can lose water out of their leaves as they exchange gases with the air

explanation:

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.

the correct answer is 2 and 4