Why does carbon form four covalent bonds? A)Because carbon has a high electronegativity .B)Because carbon needs four electrons to fill its outer shell. C)Because the most common isotope has four neutrons. D)Because carbon tends to give up four electrons to balance the charge of its protons. E)Because carbon has a low electronegativity.

 How is a polymer formed from multiple monomers?a. From the growth of the chain of carbon atomsb. By the removal of an —OH group and a hydrogen atomc. By the addition of an —OH group and a hydrogen atomd. Through hydrogen bonding

Our local group is composed of how many galaxies?

Stars to the upper right of the Hertzsprung-Russell diagram tend to be relatively

What is generally the range of a star’s hydrogen burning lifetime?

What determines if a star becomes a white dwarf, a neutron star, or a black hole?

“Cosmological Redshift” refers to

The background stars during a solar eclipse are those of constellations

Light bends when it

The changing shapes of constellations in the night sky is caused by