Answer:
All the arteries except pulmonary artery carry pure blood..it is so because blood flows with a high pressure and speed And because Arteries are situated deeper under the skin have thick-walled with Narrow lumen(cavity) and pulmonary artery carries deoxygenated blood i.e without oxygen..
Explanation:
lumen means Empty space within an object(solid)
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I am not sure but I am guessing carbon and nitrogen :)
2 - Human refuse to stop polluting.
All other three are attempting to attack the problem of pollution.
Answer:
because your teacher said it is
Sum everything up that you have written e.g.
This data shows that children of the 80’s grew up to be the most fun.
