If ris the radius of a circle and dis its diameter, which of the following is an
equivalent formula for the circumference C = 2?
A. C= r dr
B. C = 27 d
C. C = per
D. C = id

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.

If you answer right ill give brainliest, : )

How many different three-digit numbers can be formed using the digits 1 comma 2 comma 9 comma 6 comma 4 comma 3 comma and 8 without repetition? for example, 664 is not allowed.