Answer the following question given this paragraph: Group 1 of the periodic table consists of hydrogen and the alkali metals. Hydrogen is a very reactive nonmetal. The alkali metals are the most reactive metals. Q: Which group of the periodic table consists of hydrogen and the alkali metals? Choices: - group 2 - group 4 - group 3 - group 1 A:
group 1
(Question)
Answer the following question given this paragraph: Predators play an important role in an ecosystem. For example, if they did not exist, then a single species could become dominant over others. Grazers on a grassland keep grass from growing out of control. Predators can be keystone species . These are species that can have a large effect on the balance of organisms in an ecosystem. For example, if all of the wolves are removed from a population, then the population of deer or rabbits may increase. If there are too many deer, then they may decrease the amount of plants or grasses in the ecosystem. Decreased levels of producers may then have a detrimental effect on the whole ecosystem. In this example, the wolves would be a keystone species. Q: What type of species have a large effect on the balance of organisms in an ecosystem? Choices: - decomposers - producers - secondary consumers - keystone A:
(Answer)
keystone
Ques: Answer the following question given this paragraph: Lighter alkanes wash away protective skin oils; heavier alkanes form a protective layer. Q: How do heavy alkanes affect the skin? Choices: - they do not affect the skin - damage the skin - color the skin - form a protective layer A:
Ans: form a protective layer
(Q).
Answer the following question given this paragraph: The fetus is connected to the placenta through the umbilical cord. This is a long tube that contains two arteries and a vein. Blood from the fetus enters the placenta through the umbilical arteries. It exchanges gases and other substances with the mother's blood. Then it travels back to the fetus through the umbilical vein. Q: The umbilical cord connects the fetus to what structure? Choices: - Ovaries - uterus - cell - placenta A:
(A).
placenta
Ques:Answer the following question given this paragraph: Heat involves the transfer of thermal energy between two bodies that are at different temperatures. If you held a flask containing a reaction that releases energy, you would be able to feel the heat being transferred from the reaction into your hand. A process in which heat is released is referred to as exothermic . Conversely, reactions that absorb energy will remove energy from the surroundings, causing the container to feel cold. For example, dissolving ammonium nitrate in water will significantly lower the water temperature. Processes that absorb energy from their surroundings are called endothermic . Q: The process when heat is released is referred to as what? Choices: - geothermal - endothermic - insular - exothermic A:

Ans:exothermic
Answer the following question given this paragraph: Evaporation is a technique used to separate out homogeneous mixtures in which one or more solids are dissolved in a liquid. Typically, the mixture is heated until all of the liquid has vaporized, leaving behind the dissolved solids ( Figure below ). The vapor can also be captured and recondensed into a liquid if desired. Q: What is the term for a technique used to separate out homogeneous mixtures in which one or more solids are dissolved in a liquid? Choices: - transpiration - absorption - distillation - evaporation A:
evaporation