Which best compares radiation and conduction? check all that apply. both transfer thermal energy from warm objects to cooler objects. both can transfer energy through empty space. both transfer thermal energy by electromagnetic waves. both can transfer energy through matter. both involve the transfer of energy through direct contact.

Radiation and conduction along with convection are called the mechanisms of heat transfer. The statements that best compares radiation and conduction are the following: both transfer thermal energy from warm objects to cooler objects and both can transfer energy through matter. The difference is that conduction is through direct heat transfer; whereas, radiation transfers heat through waves. 

An autotrophic protist - they can perform photosynthesis and mainly consist of unicellular algae. they can be divided into number of systematic group according to the shape of their cell and the type of photosynthetic pigments they use.