Blood is blue before it reaches oxygen. this is why your veins are blue
Abstinence means to avoid or not want to do something. It is preferred that high school children under the age of 18 restrain from sexual activity. (Hope this helps if it did pls mark brainliest!)
Answer:
During active transport, a protein pump uses energy, in the form of ATP, to move molecules from an area of low concentration to an area of high concentration.
Explanation:
All the answers are correct
