Plant circadian rhythms tell the plant what season it is and when to flower for the best chance of attracting pollinators. Behaviors showing rhythms include leaf movement, growth, germination, stomatal/gas exchange, enzyme activity, photosynthetic activity, and fragrance emission, among others. Circadian rhythms occur as a plant entrains to synchronize with the light cycle of its surrounding environment. These rhythms are endogenously generated and self-sustaining and are relatively constant over a range of ambient temperatures. Important features include two interacting transcription-translation feedback loops: proteins containing PAS domains, which facilitate protein-protein interactions; and several photoreceptors that fine-tune the clock to different light conditions. Anticipation of changes in the environment allows appropriate changes in a plant's physiological state, conferring an adaptive advantage. A better understanding of plant circadian rhythms has applications in agriculture, such as helping farmers stagger crop harvests to extend crop availability and securing against massive losses due to weather.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What are constant but not self sustaining?
Ah, so.. unanswerable

Relations between Nasser and Qasim grew increasingly bitter on 9 March, after Qasim's forces suppressed a rebellion in Mosul, launched a day earlier by a pro-Nasser Iraqi RCC officer backed by UAR authorities. Nasser had considered dispatching troops to aid his Iraqi sympathizers, but decided against it. He clamped down on Egyptian communist activity due to the key backing Iraqi communists provided Qasim. Several influential communists were arrested, including Nasser's old comrade Khaled Mohieddin, who had been allowed to re-enter Egypt in 1956.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): What did Quasm do to anger Nasser?
Ah, so.. suppressed a rebellion in Mosul

Raleigh (/ˈrɑːli/; RAH-lee) is the capital of the state of North Carolina as well as the seat of Wake County in the United States. It is the second most populous city in North Carolina, after Charlotte. Raleigh is known as the "City of Oaks" for its many oak trees, which line the streets in the heart of the city. The city covers a land area of 142.8 square miles (370 km2). The U.S. Census Bureau estimated the city's population to be 439,896 as of July 1, 2014. It is also one of the fastest-growing cities in the country. The city of Raleigh is named after Sir Walter Raleigh, who established the lost Roanoke Colony in present-day Dare County.
If it is possible to answer this question, answer it for me (else, reply "unanswerable"): Who is it named after?
Ah, so..
Sir Walter Raleigh