On the dorsal surface of the heart are the stumps of two relatively large but thin-walled blood vessels that enter the right atrium. They are connected, and you would be able to pass a slender probe continuously through them. The upper vessel is the superior vena cava, and the lower one is the inferior vena cava. 6. Observe the inside of the right atrium. What do you notice

What enzyme is most important for dna replication and why?

Which of the following is likely not involved in this example of ecological succession? a) the rotting remains of plants add to the fertility of the soil. b)the soil becomes so fertile that eel grass is replaced by other plant species. c) the roots from plants stabilize the sediment, keeping it in place. d) the concentration of salt becomes so high that all plant life is destroyed.

Which material is commonly used as a culture medium for living cells