Which of the following scenarios represents change to an ecosystem brought about by biotic factors?
a. a wildfire caused by lightning striking a tree
b. a flood caused by a severe storm
c. a landslide caused by cattle overgrazing
d. a volcano

The correct answer is (c) a landslide caused by cattle overgrazing

The biotic factor of ecosystem is the plants and animal species. The landslide caused by cattle overgrazing is the best example that can change the ecosystem caused by biotic factors. Overgrazing is caused due to eating of plants in huge amount by the grazers. This loosens the soil because the plants hold the soil and removal of these plants can led to landslide.

C. A landslide caused by cattle overgrazing

Explanation:

it has one origin of replication, but it proceeds in two directions - d)