G1-3
What is "Sweet Water"?
Freshwater
True or False: Freshwater has a lot of salt in it.
False
What percentage of Earth's water is freshwater, and where is most of it hidden?
3%; Most is frozen in glaciers.
"Invertebrate" and name one freshwater example.
An animal with no backbone; (e.g., shrimp, snail, or crab).
Where does freshwater come from?
Rain and snow.
Name one place where you can find freshwater.
Rivers, ponds, lakes, streams, or wetlands.
Why are wetlands often called "giant sponges"?
They soak up extra water and protect the land from flooding while hiding animals in thick grass.
Compare a "still water" habitat to a "moving water" habitat. Which one requires animals to be stronger swimmers?
Still water (ponds/lakes) is calm; moving water (rivers) has currents. Rivers require stronger swimmers.
How much of Earth's water is freshwater?
Only 3%.
Which animal is a "Double-Lifer" that lives in water and on land?
Amphibians (like frogs).
How do gills work like a "water filter" for fish?
They pull oxygen out of the water and release carbon dioxide as the water passes through.
Why do freshwater animals have "pumps" in their bodies? What would happen if a freshwater fish moved to the salty ocean?
To pump out extra water; in the ocean, they would shrivel up or get sick because of the salt balance.
What do fish use to breathe underwater?
Gills.
True or False: A Snakehead fish (ปลาช่อน) can breathe air.
True.
The Snakehead Fish (ปลาช่อน) has two "superpowers" that help it survive outside of deep water. What are they?
It can breathe air and "walk" (wiggle) on land for a short time.
Why is the Beaver called "Nature's Architect"? How does its work change the environment?
It builds dams, which turns moving streams into calm ponds for other animals to live in.
Where does a mother shrimp carry her eggs?
Under her tail.
Is a pond moving water or still water?
Still water.
What is the function of a Swim Bladder (ถุงลม)? What happens to a fish if this organ is damaged?
It controls buoyancy (floating/sinking). If damaged, the fish cannot stay at the right depth and might sink or float sideways.
Why would a freshwater fish shrivel up and die if you put it in the salty ocean?
Because of the salt balance; the saltwater would pull all the fresh water out of the fish's body.