biotic : mollusks → abiotic : soil"Biotic" means living things (like mollusks). "Abiotic" means non-living parts of the environment, like soil.lotic : river ; lentic : pond"Lotic" means moving water (river), while "lentic" means still water (pond).prawn pond : artificial → forest : naturalA prawn pond is man-made or artificial, while a forest is natural.sea : aquatic ; grassland : terrestrialThe sea is an aquatic environment (water-based), while grassland is a terrestrial environment (land-based).salt water : ocean : fresh water : lakesThe ocean is made of salt water, and lakes contain fresh water.