Answer: that veins have valves to prevent backflow and arteries don’t.
Explanation:
Answer:
C
Explanation:
It moves across the cell membrane via simple diffusion, a process that requires no energy input and is driven by the difference in concentration levels on each side of the cell membrane.
Answer:
Explanation:
unless you give more information im just gonna say the distance is the difference here
wetland can be like swamps
