Three hundred fifteen thousand, seven hundred fifty-six written in standard form?

What are potential hypotheses (explanations) regarding why there are ecological equivalents between many metatherians and eutherians? discuss your hypothesis in terms of the processes that could lead to the current ecologies and distributions of metatherians and eutherians.

Find x to the nearest hundredth place

Determine the difference: 3.2 × 1010 – 1.1 × 1010. write your answer in scientific notation.