What type of microscopes can be used to view viruses: light microscope, electron microscope, or transmission electron microscope?

In which process is oxygen absorbed by an organism asap apex

According to the big bang theory, after the "bang," the universe remained dark until about  300,000 yearsone billion yearsthree minutesthree billion years  later, when neutral atoms began to form.

Which of the following types of stars are dim but can have high surface temperatures? giants main sequence stars supergiants dwarfs