research with the use of microscopes
idea that all living things are composed of cells, cells are the basic units of structure and function in living things, and new cells are produced from existing cells
Cell Membrane: structure
cell membrane: function
thin, flexible barrier around a cell; regulates what enters and leaves the cell
water, oxygen, food, messages.
urea, vacuole, carbon dioxide, ammonia
process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated
factors that affect diffusion
exercise- makes diffusion go faster
diffusion of water through a selectively permeable membrane
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