TASK DEFINITION: In this task, you are given a question and a context passage. You have to answer the question based on the given passage.
PROBLEM: From what era, once thought devoid of animal life, was evidence of grazer populations discovered?, Context: Some paleontologists suggest that animals appeared much earlier than the Cambrian explosion, possibly as early as 1 billion years ago. Trace fossils such as tracks and burrows found in the Tonian period indicate the presence of triploblastic worms, like metazoans, roughly as large (about 5 mm wide) and complex as earthworms. During the beginning of the Tonian period around 1 billion years ago, there was a decrease in Stromatolite diversity, which may indicate the appearance of grazing animals, since stromatolite diversity increased when grazing animals went extinct at the End Permian and End Ordovician extinction events, and decreased shortly after the grazer populations recovered. However the discovery that tracks very similar to these early trace fossils are produced today by the giant single-celled protist Gromia sphaerica casts doubt on their interpretation as evidence of early animal evolution.

SOLUTION: the Tonian period

PROBLEM: Which of the following is a character system: Fujian, Teochew, or pinyin?, Context: Hokkien /hɒˈkiɛn/ (traditional Chinese: 福建話; simplified Chinese: 福建话; pinyin: Fújiànhuà; Pe̍h-ōe-jī: Hok-kiàn oē) or Quanzhang (Quanzhou–Zhangzhou / Chinchew–Changchew; BP: Zuánziū–Ziāngziū) is a group of mutually intelligible Min Nan Chinese dialects spoken throughout Southeast Asia, Taiwan, and by many other overseas Chinese. Hokkien originated from a dialect in southern Fujian. It is closely related to the Teochew, though mutual comprehension is difficult, and is somewhat more distantly related to Hainanese. Besides Hokkien, there are also other Min and Hakka dialects in Fujian province, most of which are not mutually intelligible with Hokkien.

SOLUTION: pinyin

PROBLEM: What did artists need to show they were from?, Context: Visual arts by indigenous peoples of the Americas comprise a major category in the world art collection. Contributions include pottery, paintings, jewellery, weavings, sculptures, basketry, carvings, and beadwork. Because too many artists were posing as Native Americans and Alaska Natives in order to profit from the caché of Indigenous art in the United States, the U.S. passed the Indian Arts and Crafts Act of 1990, requiring artists to prove that they are enrolled in a state or federally recognized tribe. To support the ongoing practice of American Indian, Alaska Native and Native Hawaiian arts and cultures in the United States, the Ford Foundation, arts advocates and American Indian tribes created an endowment seed fund and established a national Native Arts and Cultures Foundation in 2007.

SOLUTION:
tribe