Valves ensure blood flows toward your heart. Vein valves work to bring the blood that flowed down via arteries back up to your heart.
Answer: Wetlands
Explanation:
Dont know how to explain it
Answer: change in solar output.
Composite Volcano: S<span>teep sided cones formed from layers of ash and lava flows.</span>
Dome Volcano: Roughly circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano
Shield Volcano: A broad domed volcano with gently sloping sides, characteristic of the eruption of fluid, basaltic lava.<span />
