Are isotopes that emit radiation because they have unstable nuclei.
a. gamma rays
b. radioisotopes
c. radioactivity
d. nuclear radiation

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

Needthe meter is the standard unit for: 1) height 2) length 3) weight 4) mass

Which of the following units is not an official si unit