instruction:
In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
question:
Despite the need for strict deadlines, which sometimes excludes new scientific findings, what reveals a steady evolution of key findings?, Context: Since the IPCC does not carry out its own research, it operates on the basis of scientific papers and independently documented results from other scientific bodies, and its schedule for producing reports requires a deadline for submissions prior to the report's final release. In principle, this means that any significant new evidence or events that change our understanding of climate science between this deadline and publication of an IPCC report cannot be included. In an area of science where our scientific understanding is rapidly changing, this has been raised as a serious shortcoming in a body which is widely regarded as the ultimate authority on the science. However, there has generally been a steady evolution of key findings and levels of scientific confidence from one assessment report to the next.[citation needed]
answer:
assessment report

question:
What is Rayleigh scattering?, Context: In nature, the red color of blood comes from hemoglobin, the iron-containing protein found in the red blood cells of all vertebrates. The red color of the Grand Canyon and other geological features is caused by hematite or red ochre, both forms of iron oxide. It also causes the red color of the planet Mars. The red sky at sunset and sunrise is caused by an optical effect known as Rayleigh scattering, which, when the sun is low or below the horizon, increases the red-wavelength light that reaches the eye. The color of autumn leaves is caused by pigments called anthocyanins, which are produced towards the end of summer, when the green chlorophyll is no longer produced. One to two percent of the human population has red hair; the color is produced by high levels of the reddish pigment pheomelanin (which also accounts for the red color of the lips) and relatively low levels of the dark pigment eumelanin.
answer:
optical effect

question:
A councilman is around for?, Context: Richmond city government consists of a city council with representatives from nine districts serving in a legislative and oversight capacity, as well as a popularly elected, at-large mayor serving as head of the executive branch. Citizens in each of the nine districts elect one council representative each to serve a four-year term. Beginning with the November 2008 election Council terms was lengthened to 4 years. The city council elects from among its members one member to serve as Council President and one to serve as Council Vice President. The city council meets at City Hall, located at 900 E. Broad St., 2nd Floor, on the second and fourth Mondays of every month, except August.
answer:
4 years