Only cells can be viewed under an electron microscope because of the radiation it sends out.

An electron microscope provides clearer, more detailed images than light microscopes.

that can be viewed under electron microscope are ribosomes, vacuoles, Golgi body, rough endoplasmic reticulum, smooth endoplasmic reticulum, mitochondria, nuclear membrane, nuclear pores, nucleolus.

as resources become scarce because of population growth, the growth decreases after few years due to lack of resources and food.