What are the 4 significant figures of 31,546,000?

Which body part transports oxygen removes waste materials in carries nutrients to the body as part of the circulatory system

In one or two sentences, describe how you did in the balancing game. in a few more sentences, explain one strategy you learned for balancing more complex equations.

The reason a penny thrown straight up inside a bus will come back to your hand is that you,the bus,the air inside the bus, and the penny are all moving at the same velocity. true or false