The geometry for boron atom in f3b-nh3
a) trigonal pyramidal
b) tetrahedral
c) trigonal bipyramidal
d) bent

Which function is performed by earths atmosphere? a. ultraviolet rays are prevented from reaching the ozone layer. b. earths temperature is raised and moderated by trapping in heat c. charged particles from the sun are prevented from reaching earth. d. magnetic charges from space are prevented from reaching earths surface.

How does the principle of electromagnetism explain the interaction between earth’s magnetic field and the solar wind?

Which class of molecules functions as chemical signals? hormones water carbohydrates proteins