<em><u>valves:</u></em><em><u /></em><u /> veins have valves arteries do not have...
<em><u>lumen:</u></em><em><u /></em><u /> in arteries it is small while in veins it is large...
<em><u>walls:</u></em><em><u /></em><u /> in arteries walls are thick ..in veins walls are thin...
<em><u>blood:</u></em><em><u /></em><u /> veins have deoxygenated blood (except pulmonary vein) .. while arteries have oxygenated blood...(except pulmonary artery)...
<span>Water has a rather high specific heat, so it takes quite a bit of energy to raise or lower the temperature of water. therefore, water helps keep the temperature of living things. </span>
Answer:
<h2>I think its 16</h2>
Explanation:
I dont remember Roman numerals that much so I tried it might be wrong I'm not sure
True, Methane is a greenhouse gas
