Which of the following is true?
a. human disturbances are a density-dependent limiting factor.
b. the 'slash and burn' method of clear cutting a forest is a
density-independent limiting factor.
c. disease is not considered a potential limiting factor.

!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.

In which situations is the principle of cross-cutting relationship useful in determining relative age?

What did not occur in the proterozoic eon a)the oxygen levels increase greatly in the atmosphere,b)the emergence of the eukarya , c)muti cella’s eukaryotic organisms began to diversify,d)anaerobic bacteria kept thriving with more oxygen