Problem: Animal:

A zygote initially develops into a hollow sphere, called a blastula, which undergoes rearrangement and differentiation. In sponges, blastula larvae swim to a new location and develop into a new sponge. In most other groups, the blastula undergoes more complicated rearrangement. It first invaginates to form a gastrula with a digestive chamber, and two separate germ layers an external ectoderm and an internal endoderm. In most cases, a mesoderm also develops between them. These germ layers then differentiate to form tissues and organs.

What may be formed between the external ectoderm and an internal endoderm layers?
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A: mesoderm

Problem: Matter commonly exists in four states (or phases): solid, liquid and gas, and plasma. However, advances in experimental techniques have revealed other previously theoretical phases, such as BoseEinstein condensates and fermionic condensates. A focus on an elementary-particle view of matter also leads to new phases of matter, such as the quarkgluon plasma. For much of the history of the natural sciences people have contemplated the exact nature of matter. The idea that matter was built of discrete building blocks, the so-called particulate theory of matter, was first put forward by the Greek philosophers Leucippus (~490 BC) and Democritus (~470380 BC).
How many forms of solids are there?
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Answer: unanswerable

Q: What is a question about this article? If the question is unanswerable, say "unanswerable".
Thirty-nine Native American tribal governments are based in Oklahoma, each holding limited powers within designated areas. While Indian reservations typical in most of the United States are not present in Oklahoma, tribal governments hold land granted during the Indian Territory era, but with limited jurisdiction and no control over state governing bodies such as municipalities and counties. Tribal governments are recognized by the United States as quasi-sovereign entities with executive, judicial, and legislative powers over tribal members and functions, but are subject to the authority of the United States Congress to revoke or withhold certain powers. The tribal governments are required to submit a constitution and any subsequent amendments to the United States Congress for approval.
Who must approve tribal constitutions?
A: the United States Congress

Context and question: The Egyptian art collection at the Mabee-Gerrer Museum of Art in Shawnee is considered to be the finest Egyptian collection between Chicago and Los Angeles. The Oklahoma City Museum of Art contains the most comprehensive collection of glass sculptures by artist Dale Chihuly in the world, and Oklahoma City's National Cowboy and Western Heritage Museum documents the heritage of the American Western frontier. With remnants of the Holocaust and artifacts relevant to Judaism, the Sherwin Miller Museum of Jewish Art of Tulsa preserves the largest collection of Jewish art in the Southwest United States.
Where is the largest collection of Dale Chinuly's work?
Answer: Oklahoma City Museum of Art

Question: Although the Estonian orthography is generally guided by phonemic principles, with each grapheme corresponding to one phoneme, there are some historical and morphological deviations from this: for example preservation of the morpheme in declension of the word (writing b, g, d in places where p, k, t is pronounced) and in the use of 'i' and 'j'.[clarification needed] Where it is very impractical or impossible to type s and z, they are substituted with sh and zh in some written texts, although this is considered incorrect. Otherwise, the h in sh represents a voiceless glottal fricative, as in Pasha (pas-ha); this also applies to some foreign names.
Is there an answer to this question: What principles never govern the Estonian orthography?

Answer: unanswerable

QUES: This multilevel construct is consistent with Dasmann and Lovejoy. An explicit definition consistent with this interpretation was first given in a paper by Bruce A. Wilcox commissioned by the International Union for the Conservation of Nature and Natural Resources (IUCN) for the 1982 World National Parks Conference. Wilcox's definition was "Biological diversity is the variety of life forms...at all levels of biological systems (i.e., molecular, organismic, population, species and ecosystem)...". The 1992 United Nations Earth Summit defined "biological diversity" as "the variability among living organisms from all sources, including, 'inter alia', terrestrial, marine, and other aquatic ecosystems, and the ecological complexes of which they are part: this includes diversity within species, between species and of ecosystems". This definition is used in the United Nations Convention on Biological Diversity.

What year did the United Nations Earth Summit define "biological diversity"?
What is the answer?
ANS:
1992