During the , over 96% of marine species and many terrestrial species became extinct, possibly because intense volcanic activity warmed Earth's climate.

The ruiz family is exchanging euros for us dollars. the exchange rate is 1 euro equals 1.35261 usd. since the ruiz family knows that usd are stated to the nearest hundredth of a dollar, they used the conversion ratio

The most famous fossil called archaeopteryx is which of the following? a dinosaur a fern a fish a bird

Vinegar has a ph of 3, and household ammonia has a ph of 11. is the concentration of h+ greatest in the vinegar or ammonia?