The relationship between organisms where both organisms benefit is called______________

• mutualism
• commensalism
• predation
• parasitism

The main use of fossil fuels by humans is to use the thermal energy they contain to produce_________________________

• biodiesel
• ethanol
• electricity
• nuclear power

Passive solar heating makes use of the sun's energy ______________

• indirectly
• directly
• through a consumer
• through a producer

When an organism reaches its _____________________, the number of organisms will level off and be in equilibrium with the surrounding ecosystem.

• population growth point
• TFR
• carrying capacity
• population paradise

A remora is attaching itself to a shark for a free ride and to eat the scraps dropped by the shark without affecting the shark is an example of _______________________

• mutualism
• parasitism
• predation
• commensalism

One advantage of nuclear energy is that it does not produce any ___________________

• radioactive waste
• risk of pollution
• air pollution
• steam

When all the resources are used and no more resources such as space or food are available, a ________________ must stop growing.

• rock
• star
• population
• river

Coal, Natural Gas and Oil are known as _____________________

• Biotic factors
• fossil fuels
• alternative energies
• renewable energies

Nuclear power, Hydro-power and Biomass are known as __________________ energy alternatives. 

• alternative
• biotic
• conventional
• non-renewable

Solar, Wind and Geothermal energy are known to be _______________ and _________________ energy sources.

• renewable, alternative
• renewable, conventional
• conventional, alternative
• nonrenewable, conventional