Variable would be the most logical
Answer: Low levels of testosterone has been linked to joint pain and may cause rheumatoid arthritis in the long run. Rapid growth can lead to joint damage as <span>the accelerated bone growth disrupts the supply of blood to the cartilage, causing bone death and regrowth.
Hope this helps!</span>
The term you're referring to which scientists implement to describe "different forms of life on Earth" is perhaps "Organism".
That would be peptide bonds
