conduction and convection require moving particles to transfer heat. Since particles are not involved in radiation, what distant source can radiate heat for all life on earth?

Any vitamins or supplements can be obtained without prescription and are widely used as alternative from western medications. most supplements are not valued by the fda or any other drug and food agencies.

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

The population of unionid mussels decreased after zebra mussels were introduced. zebra mussels competed with the unionid mussels for food. the zebra mussels were able to displace the unionid mussels, allowing the zebra mussel population to increase  over the years. the unionid mussel population decreased because  of lack of food.