Which of the following describes a density - independent factor?
A. a parasite that infests pig intestines
B. a lion hunting and killing zebra
C. a factor that depends upon population size
D. a hurricane that wipes out the bird population on an island

Asquirrel population lives in an area. over many years, a river in that area grows wider and stronger, eventually forming a canyon. the squirrel populations on the two sides of the canyon can no longer mate with each other and ultimately form distinct species. this is an example of

If the nucleus of a cell was removed the cell wouldn’t be able to make proteins because

Suppose you are provided with an actively dividing culture of e. coli bacteria to which radioactive thymine has been added. what would happen if a cell replicates once in the presence of this radioactive base?