Answer:

Step-by-step explanation:
you need to cross multiple
Step-by-step explanation:
F respiratory system only remove carbon dioxide from the body
Answer:
Let a and b integers and suppose that are even numbers. Then, exist integers k and m such that
and
.
Then,

Since, k and m are integers then n=k+m is an integer. Then, since a + b is of the form 2 by an integer n, then a + b is an even number.