Define water cycle?

56

Explain the typical conformation of the age pyramids of underdeveloped countries?

67

What is biodiversity?

103

What are pioneer species? What is the role of the pioneer species?

101

How does gpp relate to photosynthesis?

54

What is the difference between primary ecological succession and secondary ecological succession?

83

What are deciduous trees?

94

What is numeric pyramid? What does it represent?

102

Can food chain present quaternary consumers without having secondary or tertiary consumers?

92

Can food chain present quaternary consumers without having secondary or tertiary consumers? Can a tertiary consumer of one chain be a primary or secondary consumer of another chain?

60

What are primary consumers? Can food chain present quaternary consumers without having secondary or tertiary consumers? Can a tertiary consumer of one chain be a primary or secondary consumer of another chain?

125

Into which type of energy is the light used in photosynthesis transformed.

54

Define species?

73

What is commensalism?

70

What is the respective importance of water, carbon, and nitrogen for the living beings?

106