Why is it important to dispose of wastes from nuclear power plants carefully? a) the wastes cause the greenhouse effect. b) the wastes are radioactive and could cause cancer. c) the wastes do not decompose and take up a lot of space. d) the wastes flow into ponds and lakes and cause algal bloom.

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

Which of these best describes an ionic bond?

Why do cells appear different in distilled water than they do in 10% salt water?