Which of the following is not a method of soil conversation

One statements is an example of a scientific observation. another statement is an example of a scientific explanation. identify the correct statement for each category to illustrate how scientific explanations are inferred from scientific observations.

When a person is exercising the body needs to deliver increased amounts of oxygen to the muscles which component of blood ensures that the muscles will receive it

Which of these substances does not protect against invaders in the nonspecific immune response? a. saliva b. mucus c. tears d. urine