Answer:
Explanation:
The cell membrane, also called the plasma membrane, has the following characteristics:-
It is present as the outermost layer in animal cells and lies below the cell wall in plant cells.
The cell membrane surrounds the cytoplasm of living cells, physically separating the intracellular components from the extracellular environment.
The cell membrane is semi-permeable, ie, it allows some substances to pass through it and does not allow others.
It is thin, flexible and a living membrane, which consists of a lipid bilayer with embedded proteins/
The cell membrane has large content of proteins, typically around 50% of membrane volume. These proteins are important for cell because they are responsible for various biological activities.
Answer:
The layer of the atmosphere that has the lowest density is the exosphere.
the troposphere is the highest density
Explanation:
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Answer:
There is a term "atmospheric circulation". It is when the air throughout the globe moves around. When the sun heats air near the equator more, and less at the poles. So the equator is warmer. The warm air near the equator moves either towards the south or the north, toward the poles. The warm air also rises up, and the cold air sinks. This is convection, but at a global scale. THis is also the cause of wind.
