Answer:
The rings of the ladder are formed by complementary pairs of nitrogen bases — A always paired with T and G always paired with C.
Explanation:
Having unprotected sex. Having sexual contact with multiple partners. Having a history of STIs. Misuse of alcohol or recreational drugs. Needling sharing spreads many serious infections including HIV and hepatitis A+B.
Answer:
True
Explanation:
The process of fainting is caused by a lack of oxygen to the brain. This can be caused by strenuous exercise (where blood is pooled more in the extremities of the body), stopping breathing (where no oxygen can enter the lungs and be transported to the brain), among other things.
During exercise, the muscles in the body's extremities need to move more, therefore they require more energy, the cells make that energy using oxygen, and therefore blood is directed more to the extremities during exercise.
