1. What does destruction refer?

176. Choose the main driver that causes biotic reactions between living organisms.
A) Topographic factors
B) Edaphic factors
C) Demand for food resources
D) Humidity
E) Temperature
177. What process is the basis of the biotic cycle in the biosphere?
A) synthesis reactions
B) photosynthesis
C) decomposition reactions
D) decay
E) respiration
178. Dr. Schindler and his team of researchers at the Experimental Lakes Area 
noticed a significant growth in algae when they added fertilizer heavy in ___to the 
water:
A) Calcium
B) Carbon
C) Phosphorus
D) Oxygen
E) Nitrogen
179. Which factor of ecosystem has the greatest impact on the formation of a fertile 
topsoil?
A) Anthropogenic factors
B) Abiotic factors
C) Climatic factors
D) Biotic factors
E) Time
180. Choose negative interaction.
A) Proto cooperation
B) Commensalism

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C) Symbiosis
D) Mutualism
E) Antibiosis
181. Ammonium (NH
4
) stays in soil, while nitrate (NO
3
) is easily leached out. Why do 
they behave so differently?
A) NH
4
is unavailable to organisms, so it remains unchanged in the soil
B) NO
3
is broken down by bacteria, so it is easily carried away
C) NH
4 
has a positive charge and sticks to soil particles
D) NO
3 
is only produced when water is flowing through soil
E) NO
3 
is only produced when soil erosion happening
182. What concept does not provide the "reliability" of natural ecosystems?
A) balance
B) survivability
C) reproduction of the territory
D) stability
E) security