3. What role do valves play in the heart?
4. Which structure in the heart functions as the natural pacemaker? What does this term mean?
5. How does the movement of the electrical impulse relate to the contraction of the chambers of
the heart?
O AME

Average annual precipitation and are the two major features that define the biomes on earth.

The finches on the galapagos island were similar in form except for variations of their beaks. darwin observed that these variations were useful for: attracting a mate defending territory building nests gathering food

Pink fur (p) is dominant to purple fur (p) in hamsters. two heterozygous pink hamsters are crossed. what is the probability that these two parents will have an offspring with purple fur? 2/4, 1/2 or 50% 1/4 or 25% 3/4 or 75% 4/4 or 100% there is no chance for this type of offspring