Q: An important chemical compound, which supplies living things with the energy they need to survive, is composed of carbon, oxygen and atoms of what other element? Read this paragraph and choose the correct option from the provided answers: The opening image is a model of an important chemical compound. Without it, living things would not have the energy they need to survive. Compared with most other compounds in living things, molecules of this compound are small and simple. In the model, the gray circles represent carbon atoms, the red circles represent oxygen atoms, and the black circles represent hydrogen atoms. Choices: - magnesium - nitrogen - calcium - hydrogen A:
hydrogen

Q: What do willow trees produce to kill bacteria? Read this paragraph and choose the correct option from the provided answers: Plants don't have immune systems, but they do respond to disease. Typically, their first line of defense is the death of cells surrounding infected tissue. This prevents the infection from spreading. Many plants also produce hormones and toxins to fight pathogens. For example, willow trees produce salicylic acid to kill bacteria. The same compound is used in many acne products for the same reason. Exciting new research suggests that plants may even produce chemicals that warn other plants of threats to their health, allowing the plants to prepare for their own defense. As these and other responses show, plants may be rooted in place, but they are far from helpless. Choices: - chlorophyll - enzymes - cytoplasmic acid - salicylic acid A:
salicylic acid

Q: Q: What is one function of the nervous system in humans? Read this paragraph and choose the correct option from the provided answers: Controlling muscles and maintaining balance are just two of the functions of the human nervous system. What else does the nervous system do?. Choices: - controlling emotion - producing hormones - controlling thought - controlling muscles A:
A: controlling muscles

Question: Q: Electrons in inner shells are called what? Read this paragraph and choose the correct option from the provided answers: because of interactions between the electrons of the outermost shell of different atoms, called the valence shell electrons. Electrons in inner shells are called core electrons. Elements are grouped together by similar chemical properties into a chart called the periodic table. Vertical columns of elements are called groups or families. Some of the groups of elements have names, like the alkali metals, the alkaline earth metals, the halogens, and the noble gases. A horizontal row of elements is called a period. Periods and groups have differing numbers of elements in them. The periodic table separates elements into metals, nonmetals, andsemimetals. The periodic table is also separated into main group elements,transition metals, lanthanide elements, and actinide elements. The lanthanide and actinide elements are also referred to as inner transition metal elements. The shape of the periodic table reflects the sequential filling of shells and subshells in atoms. The periodic table helps us understand trends in some of the properties of atoms. One such property is the atomic radius of atoms. From top to bottom of the periodic table, atoms get bigger because electrons are occupying larger and bigger shells. From left to right across the periodic table, electrons are filling the same shell but are being attracted by an increasing positive charge from the nucleus, and thus the atoms get smaller. Choices: - inner electrons - surface electrons - valence electrons - core electrons A:
Answer: core electrons

*Question*
Q: Researchers have also used insect courtship to explore genetic variation underlying differences in what? Read this paragraph and choose the correct option from the provided answers: Choices: - reproduction - function - instance - behavior A:
**Answer**
behavior

*Question*
Q: What two organs secrete fluids that aid in digestion? Read this paragraph and choose the correct option from the provided answers: The pancreas and liver secrete fluids that aid in digestion. Choices: - kidney and gall bladder - stomach and lung - spleen and bladder - pancreas and liver A:
**Answer**
pancreas and liver