The various types of symbosis include: 1  parasitism-one species (parasite) benefits more than the other species (host). 2  commensalism-one species benefits while a second species is neither helped nor injured. 3  mutualism-both species benefit from the interaction.he various types of symbosis include: 1  parasitism-one species (parasite) benefits more than the other species (host). 2  commensalism-one species benefits while a second species is neither helped nor injured. 3  mutualism-both species benefit from the interaction.
Many different types of energy can be converted into heat energy. Light, electrical, mechanical, chemical, nuclear, sound and thermal energy itself can each cause a substance to heat up by increasing the speed of its molecules.
Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. In the context of mechanics problems, we are usually interested in the role thermal energy plays in ensuring conservation of energy. Almost every transfer of energy that takes place in real-world physical systems does so with efficiency less than 100% and results in some thermal energy. This energy is usually in the form of low-level thermal energy. Here, low-level means that the temperature associated with the thermal energy is close to that of the environment. It is only possible to extract work when there is a temperature difference, so low-level thermal energy represents 'the end of the road' of energy transfer.