1. What does destruction refer?

13. ____________ are composed of plant and animal residues, which consist of 
carbohydrates, proteins, and more complex compounds.
A) Suspended particles
B) Waterborne soil particles
C) Chemical particles
D) Clay particles
E) Organic particles
14. What does symbiosis mean?
A) living in a community with no interaction between each other
B) living together in fear of each other
C) living separately, no relationship between 2 species
D) living together, close relationship between 2 species
E) living separately and compete each other
15
. Choose the correct determination for “thermal pollution” as a stress factor in 
ecosystem modelling
A) can be ignited by people, or naturally by lightning. A severe fire consumes much of the 
biomass of an ecosystem, but even a less-severe wildfire may kill many organisms by 
scorching and poisoning by toxic gases
B) a disturbance in which there is an intense exposure to kinetic energy, which causes 
damage to habitats and ecosystems. Examples include such disruptive events as a 
hurricane or tornado, a seismic sea wave (tsunami), the blast of a volcanic eruption, an 
explosion, or trampling by heavy machinery or hikers
C) it is caused by excessive exposure to ionizing energy. The radiation may be emitted by 
nuclear waste or explosions, or it can be diagnostic X-rays or solar ultraviolet energy
D) may occur at natural springs and submarine vents where geologically heated water is 
emitted. It is also associated with discharges of hot water from power plants
E) it is associated with insufficient or excessive regimes of temperature, moisture, solar 
radiation, wind, or combinations of these

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16. What is called an agrarian landscape?
A) the formation of ecosystems as a result of landscape changes under the influence of 
urban development
B) the formation of ecosystems as a result of landscape changes under the influence of 
industry and urban planning
C) the formation of ecosystems as a result of landscape changes under the influence of 
agriculture
D) the formation of ecosystems as a result of landscape changes under the influence of 
industry
E) the formation of ecosystems as a result of landscape changes under the influence of 
agriculture and urban planning