Anthropology=human culture, hydrology=water, meteorology=climate, and geophysics=inside of earth.
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It is sub-classified as a rough, or granular ER, and a smooth or agranular ER. The rough Endoplasmic reticulum is lined with ribosomes and modifies and packages proteins that have been produced by the ribosome. In skeletal and cardiac muscle it is known as the sarcoplasmic reticulum.
They must find food
they must find shelter
This is not a biology question this is a math question