State lab review packet answers diffusion through a membrane -beaks of finches - making connections - relationships and bio diversity

Diffusion can happen with or without a membrane. It always takes place down a concentration gradient, which means the substance will diffuse from an area  of higher concentration to an area of lower concentration.

Biodiversity is critical to maintaining the balance of the ecosystem. Without a diverse collection of organisms, the species in the environment cannot thrive and are at a risk of extinction in extreme cases.

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