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I think the border of the city or like a fence or wall would be the best one I can think of.
It could be a gate. It is a gate because the door is the cell membrane. See you need to get past the cell wall before the cell membrane.
A prokaryote is a kingdom but it fits into into the Monera kingdom. Prokaryotes are molecules surrounded by membrane and cell wall.
No Human being can fly, Superman-Fashion. Man, unlike Bats ( good analogy) birds, and some insects , is not aerodynamically sound. One hastens to add, neither are Reindeer.
A good analogy for ER is a hospital. It is a good analogy because they are all trying to play their part
i like to lick my butt hole in the morning
A door because the Cell Membrane controls what goes in and out of the cell, and so does a door. A door keeps things like wind and bugs out from coming inside, a door also saves you from losing cool air in the summer and heat in the winter.
A benefit of using good human relations is that you are able to get more output. The human relations will ensure that people are motivated in the right way and efficiency is enhanced.
cell membrain: school doors, regulates traffic inside and out the school cell Wall: the school walls, protects the school cytoplasm: the air in the school that allows people to be there vacuole: closets of the school, stores stuff
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There are a great many different analogies for cell parts that are used to teach. A biology teacher may compare organelles to the organs in the human body for example.