Avialans diversified into a wide variety of forms during the Cretaceous Period. Many groups retained primitive characteristics, such as clawed wings and teeth, though the latter were lost independently in a number of avialan groups, including modern birds (Aves). While the earliest forms, such as Archaeopteryx and Jeholornis, retained the long bony tails of their ancestors, the tails of more advanced avialans were shortened with the advent of the pygostyle bone in the group Pygostylia. In the late Cretaceous, around 95 million years ago, the ancestor of all modern birds also evolved a better sense of smell.
During which time period did avialans diversify into a wide variety of forms?
Cretaceous Period

In 1995 the National Lottery granted money for a 4.6m sports complex, to add to Eton's existing facilities of two swimming pools, 30 cricket squares, 24 football, rugby and hockey pitches and a gym. The College paid 200,000 and contributed 4.5 hectares of land in return for exclusive use of the facilities during the daytime only. The UK Sports Council defended the deal on the grounds that the whole community would benefit, while the bursar claimed that Windsor, Slough and Eton Athletic Club was "deprived" because local people (who were not pupils at the College) did not have a world-class running track and facilities to train with. Steve Osborn, director of the Safe Neighbourhoods Unit, described the decision as "staggering" given the background of a substantial reduction in youth services by councils across the country, a matter over which, however, neither the College nor the UK Sports Council, had any control. The facility, which became the Thames Valley Athletics Centre, opened in April 1999.
For what did the college pay a substancial sum and donate 4.5 hectres of land?
in return for exclusive use of the facilities during the daytime only

The crowd roared in approval and Arab audiences were electrified. The assassination attempt backfired, quickly playing into Nasser's hands. Upon returning to Cairo, he ordered one of the largest political crackdowns in the modern history of Egypt, with the arrests of thousands of dissenters, mostly members of the Brotherhood, but also communists, and the dismissal of 140 officers loyal to Naguib. Eight Brotherhood leaders were sentenced to death, although the sentence of its chief ideologue, Sayyid Qutb, was commuted to a 15-year imprisonment. Naguib was removed from the presidency and put under house arrest, but was never tried or sentenced, and no one in the army rose to defend him. With his rivals neutralized, Nasser became the undisputed leader of Egypt.
Who avoided a death sentence in favor of 15 years in jail?
Sayyid Qutb