You can supply activation energy to begin a reaction by adding an inhibitor cooling the reaction beaker in an ice bath adding a catalyst heating the reaction beaker over a burner

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

Significant figures are digits read directly from the measuring instrument plus one more digit, which is __ by the observer.

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients