|Topics||Cytoplasm, Meteoroids, Proton, Spinal Cord, Troposphere|
The nucleus of a eukaryotic cell contains the genetic material of the cell and is surrounded by cytoplasm which contains many organelles. These include:
|endoplasmic reticulum||helps synthesize proteins and fats|
|Golgi apparatus||prepare proteins for use|
|lysosomes||help the cell manage waste|
|centrosomes||guide cell reproduction|
Smaller rocks shed by asteroids and comets are called meteoroids. When these rocks reach Earth's atmosphere, they burn up in the mesosphere and become meteors. If a meteor manages to reach the Earth, it is called a meteorite.
A proton is a subatomic particle found in the nucleus of an atom. It carries a positive electric charge.
The spinal cord connects the brain to the body's network of nerves. It carries impulses between all organs and the brain and controls simple reflexes.
The Earth's atmosphere has several layers starting with the troposphere which is closest in proximity to the surface. Containing most of the Earth's breathable air (oxygen and nitrogen), it's a region with warmer temperatures closer to the surface and cooler temperatures farther away which results in the rising and falling air that generates weather.