A length is measured as 21 cm correct to 2 significant figures. a) What is the lower bound for the length?
b) What is the upper bound for the length?

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.

Some boys and girls were asked if they had a pet. one third of the group were boys. there were 20 boys. 20% of the girls had a pet. boys with a pet : girls with a pet = 1 : 5 i need to know how many girls there are.

Simplify. (-2)^-3 a. -8 b. -1/8 c. 1/8 d. 8