Over 500 million years ago what was British Columbia ??

500-million-year-old fossil found in BC is ancient ancestor of spiders and scorpions. Palaeontologists in British Columbia have found a fossil of the oldest known ancestor of scorpions and spiders.

Smaller molecules diffuse easily as compared to the larger molecules. In other words, smaller is the size of molecule, easier and faster is its diffusion across a semipermeable membrane.

Diffusion is a process by which molecules move ( via semipermeable membrane) from an area where its concentration is higher to an area where its concentration is lower.

Size of molecules can impact the process of diffusion as smaller is the size, faster is the rate of diffusion.