Answer: Possession of Valves
Explanation: Veins possess valves which ensures that blood flows in only one direction. Valves helps blood to flow back to the heart against gravitational force.
Arteries don't have valves because the pressure originating from the heart is capable of causing the blood to flow in one direction.
Answer:
c is the answer hope it helps
<span>The most likely means by which the zoospores spread from one free-living amphibian to another is via the flagella. The flagella is a tail-like structure on zoospores that helps them to move.</span>
