Test: New SAT Math - No Calculator

1.

Ecosystems are made of a complex system of energy and nutrient transfers from one organism to another. Some of these transfers are in the form of predation - one organism eating another – while others are in the form of ecosystem engineering, an organism changing the environment around them. One major form of ecosystem engineering is niche creation. Niche creation is the process of an organism changing their environment to create a competitive advantage. In order for an organism to be considered as creating a niche, three things must be true: the organism must significantly modify their environment, those changes must affect other organisms’ survival, and those changes must lead to an evolutionary response in another organism.

What is the most effective way to combine the two underlined sentences at the underlined portion?

creation, which is the process by which

creation, processing

creation – the process through which

creation, the process of

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