Fine, wet crackling sounds usually caused by closed alveoli popping open when enough air pressure is applied. fluid in the lungs squeezes alveoli closed, making them unavailable for gas exchange until they can be forced open
a) true
b) false

!if we removed the wolf, snake, and hawk from this food web, what best explains the impact it would have? a) the number of producers would increase. b)the number of decomposers would increase. c)the number of primary consumers would increase. d)the numbers of primary consumers would decrease.

Which label correctly identifies what x represents in the concept map?

What is the starting point in replication called