The double layered sac surrounding the heart is the pericardium
The one with higher air pressure is Warm Air. The reason why is because when you boil water, the water always makes the lid rise. This is because Warm Air has more activity in its atoms and molecules, so it is moving around more, which in turn means that there is more pressure.
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Answer:
Turn a right on Mccallin Drive! Thank me later. ;)
Explanation:
If a scientist is studying an infectious agent in a lab, it is very important to understand the implications of evolution because then the scientist will be able to predict how the agent will adapt to different hosts.
Proteins increase the speed of reactions in the body
