The author developed his central idea throughout the text D. by discussing how people with disabilities should be taken care of by the government.
Ed Roberts stated how he contracted polio when he was fourteen. He highlighted how different policies needed to be changed so that the disabled in society will be positively affected.
He advocated for the changes that would give disabled people in society access to community life. For example, he convinced the city of Berkeley to install curb cuts that will allow wheelchair access. He simply discussed how people with disabilities should be taken care of by the government.
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The answer to this question is: Rotation Challenges. Studies show that when an employee has been handling a certain job for a prolonged period of time, the employee will develop a certain way of thinking that makes it easier for that employee to be effective in that certain job while reducing the employee's capability in doing another type of job.
We could add a solar heating to the greenhouse, or we could build a rainwater collection system for the same cost.