becoz it makes the water dirty.
a cause it kills them this is called POLLUTION
Littering can cause water pollution because trash may end up in waterways. This is a problem for the animals that live in these bodies of water because it pollutes their habitat.
They pollute the water and kill animals that live underwater.
Water pollution can kill crops, cause disease, dehydration, kill animals, and destroy the eco system. Note: If any one knows anymore effects of water pollution fell free to Improve this answer.
Water pollution is the contamination of bodies of water
They cause pollution because the chemicals put into the fertilizers run into the water; then causing water pollution.
Chemicals such as pesticides cause water pollution from storm runoff.
Water pollution is harmful to animals because when the animals eat or drink the water the water could poison the animal and the animal could die.
People cause water pollution from throwing garbage and other things into the water. Also, oil and other chemicals cause pollution.
water pollution and soil erosion caused by humans can also cause the food in the salt water to be contagious or poisonous.
Oil depots can cause water pollution. This in turn can cause animals and fish to get sick and die. This disrupts the ecosystem.
All animals that eat plants by or in the water, live in the water, swim in the water, or drink the water are polluted by water pollution. So basically, if you pollute the water, you are polluting all animals.