Answer – B (Electrons)
When atoms combine, their nucleons fuse to produce a new nucleus and interactions occur between their electrons, particularly the outer valence electrons. The interaction between the outer valence electrons of the combining atoms forms bonds between them.
D, light can travel in the air or a vacuum and the speed is constant whether the light source is stationary or moving.
Automatically region nervous system
Probably through a electron microscope either TEM or SEM. or possibly a picture through the microscope. I hope that helped.
