What is a updwelling?

Why does a pond water seem warmer at night? Do newborn fiddler crabs look like adult fiddler crabs? How many types of democarcy is there? What can a otter do to replenish the layer of lost air? My pregnant guppy is very fat but i would like to know exactly what signs she will give before giving birth.? What are the disadvantages of a protein skimmer? What does a baby wild boar look like when its a baby until its fully grown? Why people are going to see the waterfalls? How did largemouth bass become Georgia's state fish? How many types of abrasives do you have? What is a biorb fish tank made of? How do guppies survive in water with little dissolved air? Is there a megalodon still out there? How do you know when spawning betta fish is over? Are koi British? Can red claw crabs stay out Of water? What fish live in bora bora? What are you supposed to do after catching a fish and taking it home? How does a shark communicate? Do sharks sleep standing still?