Why does earth need an atmosphere?
a. th protect earth from solar winds
b. to protect earth from the suns radiation
c. to protect earth from the suns magnetic fields
d. all of the above

i think it counts for all but mostly to protect the earth from direct sun radiation

answer; i believe the correct answer is (sporophyte);

nucleic acid molecules are incredibly complex, containing the code that guarantees the four different nucleotide units comprise dna, the nucleic acid of interest to the genealogist. and one of four nitrogen-containing molecules called nucleotides