Answer is A; experiments: a scientific procedure undertaken to make a discovery, test a hypothesis, or demonstrate a known fact.
Answer:
Social Class
Explanation:
Social class is a group of people in a society that has common political, economic, or cultural status.
Let's first think what could be a "positive" impact - this would mean making the environment more clean and more friendly towards other species.
So they could clean up the environment (from the mess that was likely introduced by a human activity) and support other organisms in it - for example by removing the physical barriers for migration of other species (bridges over the streets for example) <span />
What the question????????????
