The beaker contains four liquids of different densities. The blocks in the beaker represent four different solid materials. The table below shows the densities of the four solid materials. Based on the densities of the solid materials and the densities of the liquids, which type of solid material is Block C?

Iknow the answer to 13 is b and 14 is d. i just need to know why the correct answers are correct

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

According to the diagram; a) identify the anode of the cell and write the half-reaction that occurs there b) write the overall equation for the reaction that occurs as the cell operates c) calculate the value of the standard cell potential ,e cell. d)write the shorthand notation of the cell above e)indicate the flow of the electrons on the diagram