If a football field is 100 yards, what will Roland's speed be if he were to run it for 25 seconds? Mark only one oval A 3 yards per second
B. 4 yards per second
C. 5 yards per second
D 6 yards per second tions

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

Joseph has hypothesized that sound travels in waves. if he were following the scientific method, what should he do next? a. ask a question. b. test the hypothesis. c. study the results. d. tell other scientists about his hypothesis.

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.