Oxygenated blood returns to the heart from the lungs via four pulmonary . a. arteries
b. arterioles
c. veins
d. venules

What is the next step in muscle contraction after the actin changes shape? (apex)

The idea that all living things are made up of cells is considered scientific law. this means the idea is an emerging scientific idea that has a logical explanation. has been tested with similar results at least twice. is supported by scientific consensus and a large amount of evidence. has been rejected only once by the scientific community

Which of the following are the functions of the integumentary system? yadda-yadda, the 1st answer is the brainliest. : )