To answer you question, The two main ingredients are Heat and coolness.
<span>The correct answer is (D), sheep. Didgeridoos and boomerangs are artifacts invented by humans in Australia. Koalas evolved in Australia, and to this day are only found in the wild in Australia. In contrast, sheep were first domesticated in ancient Mesopotamia and then brought by humans to other parts of the world. The first sheep were brought to Australia by ship, from the Cape of Good Hope in 1788.</span>
The change to an ecosystem that is brought about by the biotic factors is the the landslide caused by the cattle overgrazing. The answer is letter C. The word biotic means the factor should be living thing (s). Among the choices, only the cattle is living organism.