Because muscle cells are are the most worked during exercise.
Answer:
<h3>
<u>mutualistic</u> is the correct answer.</h3>
You gotta put the choices how am I going to know what to answer now
Answer:
1) All his joints are bending and flexing and his muscles are flexing as he is running.
2) The man is probably breathing really fast because he is running after is dog
Explanation:
So when one scientist turns around and says the mass of an electron is 9.10938291×10^-31 kilograms we know what a kilogram is and so we don't get an answer that it's 32949 microsmiths as he invented his own measurement because he needed one.