Explain why the terms "heterozygous dominant" and " heterozygous recessive" are never used?

Which greenhouse gas is emitted when burn fossil fuels for energy? a.nitrogen b.oxygen c.carbon dioxide d.helium

In a vegetable garden 45 bean plants have been eaten by deer 5 are untouched what is the frequency of bean plants in the garden that have been eaten?

Several billion years ago which gas was the least prevailant in the atmosphere