Objects stop emitting radiation only at 0 K, but objects may not reach 0 K, ever. Thus, no object would ever stop emitting radiation.
Chloroplasts allow plants to capture the energy of the Sun in energy molecules. This gives energy and nutrients to the plant.
A tumor that invades surrounding tissues, is usually capable of producing metastases, may recur after attempted removal, and is likely to cause death unless adequately treated.
The ozone layer is a protective gas around the earth which protects the planet and all the living things on it :-)
