Answer: gas in the air, pollution
Explanation:
Vein because they have valves to prevent back flow of blood.
Http://www.ncbi.nlm.nih.gov/pubmedhealth/PMH0072434/
There is a website with some info. Hope it helps! :)
Answer:
The lithosphere is extremely hot. The temperature of the lithosphere can reach around 600 degrees Celsius.
Explanation:
<span>Orphan records are records whose foreign key value does not refer to a primary key value. Orphan records are very common in database relationships. The process used to remove and fix orphan records is called scrubbing the database.</span>