Directional selection can be distinguished from disruptive selection by
a.
the elimination of extreme variations of traits
b.
selection for two extreme variations of a trait
c.
the preservation of gene frequencies
d.
selection for one extreme variation of a trait

Which statement describes john tuzo wilson’s contribution to the theory of plate tectonics?

20 points and brainlist 1. london has suffered from terrible air pollution for at least seven centuries. why is the city so prone to its famous “london fog? ” what did london do to get rid of its air pollution? 2. why does air pollution cause problems in developing nations more than in developed ones?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion