1. What does destruction refer?

46. Ants and acacia trees have a mutualistic relationship because
A) They are part of the same ecosystem
B) They both benefit from living with each other
C) The ants eat part of the acacia tree
D) They can not exist separately
E) They are both adapted to a humid climate
47. Choose the compartment model.
A) Equation
B) Diagram
C) Simulation
D) Algorithm
E) Flow chart
48. Which of the following is the one of the theory of the control of ecosystems 
which states that it is the nutrient supply to the primary producers that ultimately 
controls how ecosystems function?
A) Mass balance
B) Top down
C) Bottom up
D) Resilience time
E) Pathways
49. The transformations of energy in an ecosystem begin first with:
A) produce carbohydrates
B) the input of energy from the sun
C) consume the carbohydrates
D) break down the dead organisms
E) the process of photosynthesis
50. Studies of populations are concerned about:
A) populations of many species interact with one another
B) understand how the system operates as a whole

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C) the habitat and resource needs of particular species
D) the parts of earth where life exists
E) physiology, reproduction, development or behavior
51. What is the term for each step in the transfer of energy and matter within a food 
web?
A) Food chain
B) Organic mass
C) Food pyramid
D) Tropic level
E) Energy path
52. The structure of an ecosystem can be split into two main components, namely:
A) Forest and grassland
B) Producer and consumer
C) Freshwater and marine
D) Terrestrial and aquatic
E) Biotic and abiotic
53.