Artificial methods in common use include preventing the sperm from reaching the ovum (using condoms, diaphragms, etc), inhibiting ovulation (using oral contraceptive pills), preventing implantation (using intrauterine devices), killing the sperm (using spermicides)
Low density lipids (lousy) to high density lipids (happy).
True, cells are made of tissues that work together
Answer:
Larger arteries that are better able carry blood throughout the body