Is the surface temperature of white dwarf stars higher or lower than red supergiants?

What evidence is there that convection occurs in earth’s troposphere?

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.

Explain how the number of similarities between the embryos from early stage to late stage is used as evidence of a common ancestry