What do you mean by human made resources ?​

Human beings change resources in two new form like people use natural resources to make buildings, bridges ,machinery and vehicles with the help of technology such resources are called human-made resources. ... Likewise, technology is also a man-made resource. Man-made resources are mostly renewable.

Explanation:

Human being change resource in two new form like people use natural resources to make buildings , bridge and vehicles with the help of technology such resource is called human made resources..

i think its c. amphipod

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."