Which gas is not abundant in earth's atmosphere?
a. oxygen
b. hydrogen
c. nitrogen
d. argon

19. scientists use meteorites that hit earth to provide evidence of the composition of earth's interior because they hypothesize that

Will mark branliest. the theory of plate tectonics was developed with the contribution of scientists from many different disciplines. which of the following is a contribution from geophysicists?

Plz ! a scientist wants to produce a cow that makes a particular human protein in it’s milk the desired protein causes blood to clot and can be used to treat hemophilia (a blood clotting disorder). which of the following would be best for the scientist to use? a. genetic crosses. b. cloning. c. selective breeding. d. genetic engineering.