Answer: The term niche is used to describe the role an organism or population plays within its community or ecosystem. It encompasses all relationships that the organism (or population) has with its environment and with other organisms and populations in its environment.
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Substances<span> move in and </span>out of cells<span> by diffusion down a concentration gradient, through a partially permeable membrane. The efficiency of </span>movement of substances in and out<span> of a </span>cell<span> is determined by its volume to surface area ratio. ... Osmosis is a type of diffusion but refers only to the </span>movement<span> of water molecules.</span>