Which equilibrium represents a buffer equilibrium? A.
HI + H2O ⇔ H3O+ + I-
B.
HCN + H2O ⇔ H3O+ + CN-
C.
NaOH ⇔ OH- + Na+
D.
HCl + H2O ⇔ H3O+ + Cl-
E.
HClO4 + H2O ⇔ H3O+ + ClO4-

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

A50.0 ml sample of gas at 20.0 atm of pressure is compressed to 40.0 atm of pressure at constant temperature. what is the new volume? 0.0100 ml 0.325 ml 25.0 ml 100. ml

What occurs when a cell engulfs large food particals