It explains that the transition to multi-cellularity was driven by the limitations of diffusion in larger cells, necessitating the formation of smaller, organized units. Sponges, which are among ...

Diffusion is the movement of particles from higher to lower concentrations. Diffusion happens naturally and so does not require energy. Substances like oxygen, carbon dioxide and glucose move in ...

Osmosis is the diffusion of water across a membrane. Active transport moves particles from low to higher concentration. Sample exam questions - key concepts in biology - Edexcel Understanding how ...