Thermal pollution:
can reduce the oxygen supply in an aquatic ecosystem
is the release of warm water into streams, rivers, and lakes
is a negative effect of nuclear power
all of the above

Explanation:

Thermal pollution is the degradation of water quality by changing its natural temperature.

Thermal pollution is caused by releasing of coolants after use from the nuclear powerplants.

The increase in the natural temperature leads to more growth of species like algae which reduces the oxygen content in water.High temperatures are unsuitable for many aquatic species.

More over,the amount of gas dissolved in a liquid is inversely proportional to temperature.So,increase in temperature leads to decrease in oxygen content in the water bodies.

So,all the statements are correct.

c) up is the direction the magnetic force is acting on the charge.

the answer should be in the picture.