Is this a multiple choice question if so can you please type them down
C. Insufficient oxygen is reaching the muscles
I found a quizlet with the answer for this question lol
Hope that helped! :)
Answer:
In everyday language a theory means a hunch or speculation. Not so in science. In science, the word theory refers to a comprehensive explanation of an important feature of nature supported by facts gathered over time. Theories also allow scientists to make predictions about as yet unobserved phenomena".
Explanation: