What do the vessels that are
carrying oxygen-poor blood
back to heart have that stops
...
Biology, 02.12.2021 14:00 jones501324
What do the vessels that are
carrying oxygen-poor blood
back to heart have that stops
blood from flowing
backwards?
A. thick muscular walls
B. valves
C. hemoglobin
D. SA nodes
Answers: 3
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Which of the following words best matches this definition: the process in which the best adapted organisms survive and pass on their traits, while those that are not well adapted do not survive to pass on their traits. question 3 options: acquired selection natural selection artificial selection organic selection
Answers: 1