Answer:
Warm air rises at the equator and moves toward the poles. At the poles, the cooler air sinks and moves back toward the equator.
Yes you can write a report about rocks and minerals. Use compare and contrast in the report. Perhaps describe how minerals and rocks came from.
The gene that controls production of white blood cells.
Answer:
I'd say an exoskeleton.
Explanation:
My main reason for saying this is because bugs with exoskeletons survive much better than bugs with endoskeletons or (surprise surprise) no skeletons. If your skeleton is outside your body, it protects everything inside you. Endoskeletons merely help hold you together.
A closed loop system is one where the ouput of the system is at least part of the input. In a refrigerator, the output of the cooling system (the cold air inside the refrigerator) is measured, and is fed back into the system to determine whether the system needs to continue cooling.
<span>An example of a fridge that was an open loop system would be one that turns on and cools for 1 hour every 6 hours, regardless of internal temperature.</span>