Answer:
A
Explanation:
Artificial means man made or not made by nature basically, meaning that humans breeding organisms for certain characteristics would be artificial.
Answer:
Chambers
Explanation:
Oxygen-rich blood travels from the lungs to the left atrium, then on to the left ventricle, which pumps it to the rest of the body. The heart pumps blood to the lungs and to all the body's tissues through a sequence of highly organized contractions of the four chambers.
I'm pretty sure that this is the correct answer "The enzymes in the second test tube must have denatured at 1000C, since most enzymes degrade at such high temperatures." that is if you're using Plato, in which case this would be one of your answer choices.
Well for one, we used coal for electricity, water for steam engines when they were much in use, natural fossil feuls for our gasoline and oil, and we use earths oxygen/nitrogen gasses to breathe and sadly we are polluting it at a fast rate
