The graph below illustrates a change in energy during a phase change.
which explanation correctly describes the phase change in the graph? .
this is an exothermic reaction that involves melting.
this is an exothermic reaction that involves freezing.
this is an endothermic reaction that involves vaporization.
this is an endothermic reaction that involves condensation.
me !

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

Adeuteron, 21h, is the nucleus of a hydrogen isotope and consists of one proton and one neutron. the plasma of deuterons in a nuclear fusion reactor must be heated to about 3.02×108 k . what is the rms speed of the deuterons? express your answer using two significant figures.

What is the chemical formula for the compound formed between sodium and flour one