What is the next letter in the following pattern q t w z

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.

This is the number of parts out of 100, the numerator of a fraction where the denominator is 100. submit

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !