Answer: Competence
Explanation: The self determination theory aims to examine the intrinsic characteristics and natural motivation leading up to choices, decisions people make.
Competence as regards the self determination theory refers to feedbacks people get for doing the right thing. These feedbacks are usually unexpected appreciation or acknowledgement an individual gets for doing the right thing or putting up a good shift. Competence has been studied to increase an individual's innate motivation. An unexpected 'thank you' call from the vice chair for doing something will only boost natural motivation.
Answer:
1/6 of the students in Robert's grade have both a sister and a brother.
Explanation:
Let x be the number of total students in Robert's grade.
It is given that In Robert's grade, 1/3 of the students have a sister.
Number of students have a sister = 
Of the students who have a sister, 1/2 also have a brother.
Number of students have both a sister and a brother = 
We need to find the fraction of the students in Robert's grade have both a sister and a brother.

Therefore, 1/6 of the students in Robert's grade have both a sister and a brother.
Answer:
During the holy month of Ramadan, which occurs on the ninth month of the lunar-based Islamic calendar, all Muslims are required to abstain from food and drink from dawn to dusk for 30 days.
Explanation:
Narcolepsy is characterized by "sleep attacks" , which are intrusions of elements of REM sleep into periods of wakefulness. In narcolepsy urgent sleep usually begins almost immediately after the onset of the attack.
<span>Treatment includes regimented sleeping schedule with frequent naps, and drug therapy, such as modafinil.</span>
My own answer is because a market failure has occurred and the market has not provided them