Which of the following contributes to maintaining the temperature on Earth? a unequal heating of Earth's surface.
b. loss of heat to space.
C. radiation of sunlight back into the atmosphere.
d greenhouse effect.

What is the total reduction potential of a cell in which potassium (k) is reduced and copper (cu) is oxidized? a. 2.59 v b. 3.27 v c. -3.27 v d.-2.59 v

Which term describes a fracture in the earth at which land stays in the same place? a. joint b. fault c. split d. hinge

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