Planets sometimes seen to reverse direction in their course across the sky with respect to the
distant stars. This effect, known as retrograde
motion, is caused by

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.

Explain why scientists use the word dominant for certain traits.

Which two molecules generated by the krebs cycle pass their high-energy electrons to the electron transport chain? a. nadh b. c6h12o6 c. fadh2 d. nad+