Answer the following question given this paragraph: Flatworms reflect several major evolutionary advances in invertebrates. They have three embryonic cell layers, including mesoderm. The mesoderm layer allows them to develop organ systems. For example, they have muscular and excretory systems. The muscular system allows them to move from place to place over solid surfaces. The excretory system lets them maintain a proper balance of water and salts. Flatworms also show cephalization and bilateral symmetry. Q: What system lets flatworms maintain a proper balance of water and salts? Choices: - homeostasis - nervous - digestive - excretory A:
excretory
Answer the following question given this paragraph: As a solid is heated, its particles vibrate more rapidly as the solid absorbs kinetic energy. Eventually, the organization of the particles within the solid structure begins to break down and the solid starts to melt. The melting point is the temperature at which a solid changes into a liquid. At its melting point, the disruptive vibrations of the particles of the solid overcome the attractive forces operating within the solid. As with boiling points, the melting point of a solid is dependent on the strength of those attractive forces. Sodium chloride (NaCl) is an ionic compound that consists of a multitude of strong ionic bonds. Sodium chloride melts at 801C. Ice (solid H 2 O) is a molecular compound whose molecules are held together by hydrogen bonds. Though hydrogen bonds are the strongest of the intermolecular forces, the strength of hydrogen bonds is much less than that of ionic bonds. The melting point of ice is 0C. Q: Which bonds are the strongest of the intermolecular forces? Choices: - complex - carbon - calcium - hydrogen A:
hydrogen
Q: Answer the following question given this paragraph: Thyroid Gland The thyroid gland is located in the neck, just below the larynx and in front of the trachea, as shown in Figure 37.16. It is a butterfly-shaped gland with two lobes that are connected by the isthmus. It has a dark red color due to its extensive vascular system. When the thyroid swells due to dysfunction, it can be felt under the skin of the neck. Q: What is the shape of the thyroid gland? Choices: - square-shaped - snake - shaped - triangle-shaped - butterfly-shaped A:
A: butterfly-shaped
Question: Answer the following question given this paragraph: The concentration of an acid or base can be determined by titration. Q: Titration is a method to determine what in acids or bases? Choices: - alkalinity - maturation - glucose - concentration A:
Answer: concentration
*Question*
Answer the following question given this paragraph: Most chemical reactions reach equilibrium at which point there is no net change. Q: At what point during a chemical reaction is there no net change? Choices: - bonding - formation - ionization - equilibrium A:
**Answer**
equilibrium
Answer the following question given this paragraph: Q: A tadpole turns into what land mammal? Choices: - a morph - A tortoise. - a pod - a frog A:
a frog