Aluminum is an element. Which best describes what makes up a sample of aluminum?A. One kind of Atom B. Two different kinds of atom C. All carbon-based atoms D. A carbon atom and non-carbon atom

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

In the following redox reaction which is the oxidizing agent and which is the reducing agent? alcl3 + na nacl + al

What is the empirical formula for c4h8o2