Context and question: Except for a few primitive organisms such as sponges (which have no nervous system) and cnidarians (which have a nervous system consisting of a diffuse nerve net), all living multicellular animals are bilaterians, meaning animals with a bilaterally symmetric body shape (that is, left and right sides that are approximate mirror images of each other). All bilaterians are thought to have descended from a common ancestor that appeared early in the Cambrian period, 485-540 million years ago, and it has been hypothesized that this common ancestor had the shape of a simple tubeworm with a segmented body. At a schematic level, that basic worm-shape continues to be reflected in the body and nervous system architecture of all modern bilaterians, including vertebrates. The fundamental bilateral body form is a tube with a hollow gut cavity running from the mouth to the anus, and a nerve cord with an enlargement (a ganglion) for each body segment, with an especially large ganglion at the front, called the brain. The brain is small and simple in some species, such as nematode worms; in other species, including vertebrates, it is the most complex organ in the body. Some types of worms, such as leeches, also have an enlarged ganglion at the back end of the nerve cord, known as a "tail brain".
Creatures that have a diffuse nerve net are called what?
Answer: cnidarians
Context and question: Three other efforts to improve regulation of international pesticide trade are the United Nations London Guidelines for the Exchange of Information on Chemicals in International Trade and the United Nations Codex Alimentarius Commission.[citation needed] The former seeks to implement procedures for ensuring that prior informed consent exists between countries buying and selling pesticides, while the latter seeks to create uniform standards for maximum levels of pesticide residues among participating countries. Both initiatives operate on a voluntary basis.
What is one important thing that should be present when countries are trading with pesticides?
Answer: prior informed consent
Context and question: Other historians find incongruity in the proposition that the very place where the vast number of the scholars that influenced the scientific revolution received their education should also be the place that inhibits their research and the advancement of science. In fact, more than 80% of the European scientists between 1450–1650 included in the Dictionary of Scientific Biography were university trained, of which approximately 45% held university posts. It was the case that the academic foundations remaining from the Middle Ages were stable, and they did provide for an environment that fostered considerable growth and development. There was considerable reluctance on the part of universities to relinquish the symmetry and comprehensiveness provided by the Aristotelian system, which was effective as a coherent system for understanding and interpreting the world. However, university professors still utilized some autonomy, at least in the sciences, to choose epistemological foundations and methods. For instance, Melanchthon and his disciples at University of Wittenberg were instrumental for integrating Copernican mathematical constructs into astronomical debate and instruction. Another example was the short-lived but fairly rapid adoption of Cartesian epistemology and methodology in European universities, and the debates surrounding that adoption, which led to more mechanistic approaches to scientific problems as well as demonstrated an openness to change. There are many examples which belie the commonly perceived intransigence of universities. Although universities may have been slow to accept new sciences and methodologies as they emerged, when they did accept new ideas it helped to convey legitimacy and respectability, and supported the scientific changes through providing a stable environment for instruction and material resources.
On the part of universities what was their reaction to giving up the Aristotelian system?
Answer:
considerable reluctance