What model do scientist use to describe how electrons move around the nucleus?

Where does the old crust move when the seafloor spreads

What causes the plates to move about on the asthenosphere?

Which is a basic unit of a sugar molecule? A) amino acid B) fatty acid C) monosaccharide D) nucleotide Which nitrogen base replaces thymine (T) in RNA? A) uracil (U) B) cytosine (C) C) adenine (A) D) guanine (G) Which is a carbohydrate?

18. Which statement about cancer is true?

When a plant performs respiration it behaves as a A. carbon source B. producer C. consumer D. carbon sink

What happens first at each origin of replication?

What is one role of ATP in the light-independent reaction of photosynthesis? ATP supplies the energy to produce glucose and other carbohydrates. ATP is produced when water molecules are split and chlorophyll electrons are excited.

Canine and feline species maintain their reproductive isolation mechanisms due to the fact that the formation of a fertilized zygote is impossible. What type of isolation describes this? a. Gametic b. Mechanical c. Temporal d. Ecological

In humans, chemical digestion is accomplished by enzyme action that begins in the mouth and ends in the a. esophagus b. stomach c. small intestine d. gallbladder

Which of the following best describes computer modeling in biology?