These are called invasive species (like the Giant African Snails in Galapagos for example.)
Answer:
I would say that the answer is A, or releasing ladybugs into a habitat.
Explanation:
This is the only "natural" way to control an aphid population. However, please note that as well as ladybugs, praying mantis's also eat aphids. But, the answer choice doesn't describe the option very well, so that is why I say that it is A.
<em>Hope it helps!</em>
it just as it is tempting to take natural selection to extreme so no not all
There is only species of a koala but you can ask how many races there are.
The name is, "phascolarctos cinereus".<span />