The constant, dynamic process of continual addition of new bone tissue (bone ) and removal of old bone tissue (bone ) is a process called bone . This ongoing process occurs at both the (outer) and (inner) surfaces of a bone. It is estimated that about of the adult human skeleton is replaced yearly. This process does not occur at the same rate everywhere in the skeleton. For example, the in our skeleton is replaced at a slower rate than the .

Tara sees a commercial for a brand of pills that promise to boost energy and people perform better in work and school. as people in the commercial talk about how much better they feel when taking the pill, tara notices a message on the bottom of the screen that reads, "this pill is not approved by doctors and has not been tested in controlled experiments." what is the best conclusion that tara should make about the commercial? it is making scientific claims based on subjective observations. it is making scientific claims based on opinions instead of pseudoscientific facts. it is making pseudoscientific claims based on objective observations. it is making pseudoscientific claims based on opinions instead of scientific facts.