In an experimental investigation, the variable that the researcher changes or manipulates in order to see its effects is called the (blank) variable.

U. life is what you go through to become a better person. it makes you stronger, wiser, and more creative. it can be hard but its ok. because i believe everyone was put here for a reason. whether or not you know that reason you should always look towards the future and trust in god for a better tomorrow.be safe and blessed

It's important for a woman to know she is pregnant within the first trimester so she won't consume any alcohol or cigarettes which will harm the baby.