A stimulus can be internal, or from within the organism itself. A stimulus can also be external, meaning it occurs outside the organism. Both internal and external stimuli can cause a response, or resulting reaction, in an organism.
A, turning on gene expression
The carbon cycle describes the process in which carbon atoms continually travel from the atmosphere to the Earth and then back into the atmosphere. ... Humans play a major role in the carbon cycle through activities such as the burning of fossil fuels or land development.
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Cancer is unchecked cell growth. Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor.
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