Hope this helps good luck. Mark brainest
Substance abuse can spread STIs because when a user shares needles with an infected person, it can spread through the blood. Any high-risk behavior like this spreads STIs.
In DNA, the "rungs" between the two strands of DNA are formed from the nitrogenous bases adenine, thymine, guanine and cytosine
1.Tt
2.tt
3.Tt
4.tt
HOPE IT HELPS YOU '_'
