Answer the following question given this paragraph: Q: Both endotherms and ectotherms control what through behavioral responses to changes in the environment? Choices: - sleep cycles - hormones - gas temperature - body temperature A:
body temperature
Answer the following question given this paragraph: Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The chapter on atoms, molecules, and ions introduced the basic idea of nuclear structure, that the nucleus of an atom is composed of protons and, with the exception of 11 H, neutrons. Recall that the number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element. When referring to a single type of nucleus, we often use the term nuclide and identify it by the notation A where X is the symbol Z X, 14 Often a nuclide is referenced 6 C. example, 146 C is called "carbon-14. Q: Atoms with the same atomic number but different mass numbers are called what? Choices: - tropes - organisms - reactions - isotopes A:
isotopes
Q: Answer the following question given this paragraph: Look at the scissors in Figure below . As you can see from the figure, scissors consist of two levers and two wedges. You apply force to the handle ends of the levers, and the output force is exerted by the blade ends of the levers. The fulcrum of both levers is where they are joined together. Notice that the fulcrum lies between the input and output points, so the levers are first-class levers. They change the direction of force. They may or may not also increase force, depending on the relative lengths of the handles and blades. The blades themselves are wedges, with a sharp cutting edge and a thicker dull edge. Q: Are scissors simple or compound machines? Choices: - lever - neither - simple - compound A:
A: compound
Question: Answer the following question given this paragraph: Iodine is added to alcohol and used as an antiseptic. It reacts with germs on cuts and wounds. Small amounts of iodine are also needed for good health. In the U. S. , iodine is added to table salt to prevent iodine deficiencies. Does the salt you use contain iodine?. Q: What is added to alcohol and used as an antiseptic? Choices: - chloride - arsenic - chlorine - iodine A:
Answer: iodine
*Question*
Answer the following question given this paragraph: Trophic level 3 = secondary consumers that eat primary consumers. Q: What trophic level are secondary consumers (which eat primary consumers) considered to be? Choices: - trophic level 5 - trophic level 4 - trophic level 2 - trophic level 3 A:
**Answer**
trophic level 3
Answer the following question given this paragraph: Oral Cavity Both physical and chemical digestion begin in the mouth or oral cavity, which is the point of entry of food into the digestive system. The food is broken into smaller particles by mastication, the chewing action of the teeth. All mammals have teeth and can chew their food to begin the process of physically breaking it down into smaller particles. The chemical process of digestion begins during chewing as food mixes with saliva, produced by the salivary glands (Figure 16.5). Saliva contains mucus that moistens food and buffers the pH of the food. Saliva also contains lysozyme, which has antibacterial action. It also contains an enzyme called salivary amylase that begins the process of converting starches in the food into a disaccharide called maltose. Another enzyme called lipase is produced by cells in the tongue to break down fats. The chewing and wetting action provided by the teeth and saliva prepare the food into a mass called the bolus for swallowing. The tongue helps in swallowingmoving the bolus from the mouth into the pharynx. The pharynx opens to two passageways: the esophagus and the trachea. The esophagus leads to the stomach and the trachea leads to the lungs. The epiglottis is a flap of tissue that covers the tracheal opening during swallowing to prevent food from entering the lungs. Q: Food is broken into smaller particles by mastication, a process involving action by what structures? Choices: - cilia - proteins - tonsils - teeth A:
teeth