The answer is that you have to make up example on how to track the fish like you have to tag the fish or track them with a recognition camera, the camera recognizes unique appearances in the fish and count how many there are, basically just give examples on how to track the number of fish.

it marks things for degradation via the proteasome. it alters there celluar location.

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.