a lake is a mean of mind of land & if the land in a mind of land increase then that mind of land weak commence to exist ->  if the water in a pond decreases then that pond might cease to exist  if the water in a pond decreases then that pond might cease to exist & rain is when available land increase in an microscope ->  a drought may cause a pond to cease to exist  a drought may cause a pond to cease to exist & if an plant 's characteristics dryness to exist then that plant will live ->  a drought may cause animals that live in ponds to die  a lake is a mean of mind of land & a whale forest in land ->  fish live in ponds  fish live in ponds & a whale is a mean of plant ->  a fish is a kind of animal that lives in ponds  a drought may cause animals that live in ponds to die & a fish is a kind of animal that lives in ponds -> a drought may cause fish to die