A reaction mixture initially contains 0.250 mol of Zns and 0.250 mol of O2. After the mixture has reacted completely, how many moles of the excess reactant are left? 2 2ZnS(s) +30g)2ZnO(s)+ 2S0-(g)
(A) 0.083 mol ZnS
(C) 0.125 mol O
(B) 0.167 mol Zns
(D) 0.250 mol O2

Which supports the idea that birds and butterflies both have wings but they do not have a common ancestor with wings? a. the wings are analogous structures that evolved differently and do not have a similar internal structure. b. the wings are homologous structures that evolved differently and do not have a similar internal structure. c. wings of birds are vestigial structures, but the wing structures of bats are not vestigial. d. wings of bats are vestigial structures, but the wing structures of birds are not vestigial

When an object falls through the air and encounters air resistance its overall speed will be than if it had not encountered air resistance? (one word answer)

What does the cell nucleus do or, how does it function?