The answer is A HOLLOW; STRING
Aristotle based his classification system off of observations of animals, and used physical characteristics to divide animals into two groups
A scientific theory is a theory that explains the scientist's observations, whereas a scientific law is a repeated pattern in the world that we have not sought an explanation for.
I think it’s d! makes sense
Cellular respiration<span> is a set of metabolic reactions and processes that take place in the </span>cells<span> of organisms to convert biochemical energy from nutrients into ATP, and then releases waste products.</span>