Models can represent things that are too far away or to small to see

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.

frogs. the lower the ph the higher the acid content. frogs have the highest tolerance in this scenario.

your body is trying to warm itself up. or more precisely, sensors in your skin send messages to your brain to generate heat to your body.

ionic bonds are two oppositely charged ions that attract. a sodium ion has a 1 positive charge; a chloride ion has a 1 negative charge. sodium and chloride have oppostive charged ions that attract which forms an ionic bond. a chemical bond formed when two atoms share electrons is called