Which of the following scenarios represents change to an ecosystem bu which of the following scenarios represents change to an ecosystem brought about by biotic factors
a. a wildfire cause by lighting striking a tree. b.a flood caused by a severe storm. c. a land line d. a volcanos

What is the 77 element on the periodtic table

The images show two species of tree frogs in a particular region. the gray tree frogs are adapted to the trees of the woodlands, while the green tree frogs can survive in woodlands or grasslands. the gray frog was abundant in the woodlands. because of climatic changes, most of the trees in the region died, and the woodlands changed to grasslands. in such a case, the . the gray tree frog is closely related to the green tree frog genetically, but they have different mating calls. this suggests that speciation occurred because of .

If a keystone species is removed from an ecosystem