Cells are the building blocks of life. They are of different shapes and sizes, and perform a variety of functions. In some organisms, cells have simple structures, but cells in animals and plants are complex. They have many organelles and a nucleus.
Rough endoplasmic reticulum cell membrane
Smooth endoplasmic reticulum Cilia
WORDS TO UNDERSTAND
botanist: a person who studies about plants and their life cycle. organelles: specialized structures within a cell. physiologist: a person who studies about living things and their behavior.
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