Answer:
preventing friction between bones
The answer is it is a waste product produced by cellular respiration.
During Gas exchange in the lungs, oxygen replaces carbon dioxide, and oxygen,
oxygenates blood that spreads throughout the body, the Carbon Dioxide, which is
expelled from the lungs originated from the cellular respiration, which occurred
inside the body.
I would say the answer is c or d
Answer:
FALSE
Explanation:
To coexist mean to exist (live) at the same time.
The dinosaurs disappeared about 66 MILLIONS years ago... that's a long time!
Humans first appear around 300 THOUSANDS of years ago.
As you see, we're not talking about the same scale of time at all, so there was never any encounter between a live dinosaur and a live human, except in the movies, that might be the reason we find them so cool. :-)
These characteristics are examples of emergent properties.
