What is the sun?
What is the weight of the earth?
What is the magnetic effect of the earth?
Define population?
Explain some examples of migratory animals?
Define biosphere?
What are tropic levels?
Define a food chain?
Which type of energy is the light used in photosynthesis transformed.
Define inharmonious ecological interaction?
Define population density?
What is the typical fauna of the tropical forests?
Explain the main types of waste?
Define transgenic food?
Explain the main factors that affect the growth of a population?