Im bored any tea that needs spilled

What percentage of the earth's water is available for use by living things?

Explain how earth is like a giant bar magnet. how is our magnetic field made?

Abag contains even and odd numbered balls in the ratio of 3: 7, respectively. for each of the following, what is the probability of drawing an even-numbered ball? the total number of balls is 240 and 30 of the odd-numbered balls are renumbered by multiplying the numbers by 4.