Answer the following question given this paragraph: Most Americans have plenty of fresh, clean water. But many people around the world do not. In fact, water scarcity is the world's most serious resource problem. How can that be? Water is almost everywhere. But much of it is unusable. What is usable is not always where it is needed. Q: What is the world's most serious resource problem? Choices: - gas shortage - citrus blight - deforestation - water scarcity A:
water scarcity
(Question)
Answer the following question given this paragraph: A nuclear fusion reaction is so named because the nuclei (center) of atoms fuse (join) together in the process. In stars like our Sun, hydrogen atoms join together to create a helium atom. Nuclear fusion reactions need a lot of energy to get started. Once they begin, they produce even more energy. ( Figure below ). Q: In stars like our sun, hydrogen atoms join together to create what? Choices: - water molecule - oxygen atom - iron atom - helium atom A:
(Answer)
helium atom
Ques: Answer the following question given this paragraph: The muscles all begin the actual process of contracting (shortening) when a protein called actin is pulled by a protein called myosin. This occurs in striated muscle (skeletal and cardiac) after specific binding sites on the actin have been exposed in response to the interaction between calcium ions (Ca++) and proteins (troponin and tropomyosin) that "shield" the actinbinding sites. Ca++ also is required for the contraction of smooth muscle, although its role is different: here Ca++ activates enzymes, which in turn activate myosin heads. All muscles require adenosine triphosphate (ATP) to continue the process of contracting, and they all relax when the Ca++ is removed and the actin-binding sites are re-shielded. A muscle can return to its original length when relaxed due to a quality of muscle tissue called elasticity. It can recoil back to its original length due to elastic fibers. Muscle tissue also has the quality of extensibility; it can stretch or extend. Contractility allows muscle tissue to pull on its attachment points and shorten with force. Differences among the three muscle types include the microscopic organization of their contractile proteinsactin and myosin. The actin and myosin proteins are arranged very regularly in the cytoplasm of individual muscle cells (referred to as fibers) in both skeletal muscle and cardiac muscle, which creates a pattern, or stripes, called striations. The striations are visible with a light microscope under high magnification (see Figure 10.2). Skeletal muscle fibers are multinucleated structures that compose the skeletal muscle. Cardiac muscle fibers each have one to two nuclei and are physically and electrically connected to each other so that the entire heart contracts as one unit (called a syncytium). Because the actin and myosin are not arranged in such regular fashion in smooth muscle, the cytoplasm of a smooth muscle fiber (which has only a single nucleus) has a uniform, nonstriated appearance (resulting in the name smooth muscle). However, the less... Q: A muscle can return to its original length when relaxed due to a quality of muscle tissue called what? Choices: - reach - viscosity - moisture - elasticity A:
Ans: elasticity
(Q).
Answer the following question given this paragraph: When chemicals in solution react, the proper way of writing the chemical formulas of the dissolved ionic compounds is in terms of the dissociated ions, not the complete ionic formula. A complete ionic equation is a chemical equation in which the dissolved ionic compounds are written as separated ions. Solubility rules are very useful in determining which ionic compounds are dissolved and which are not. For example, when NaCl(aq) reacts with AgNO3(aq) in a double-replacement reaction to precipitate AgCl(s) and form NaNO3(aq), the complete ionic equation includes NaCl, AgNO3, and NaNO3 written as separated ions:. Q: A complete ionic equation is a chemical equation in which the dissolved ionic compounds are written as what? Choices: - charged ions - joined ions - realized ions - separated ions A:
(A).
separated ions
Ques:Answer the following question given this paragraph: Understanding the "hows" and "whys" of the world is the goal of science. The term science comes from a Latin word that means "having knowledge. " But science is as much about adding to knowledge as it is about having knowledge. Science is a way of thinking as well as a set of facts. Science can be defined as a way of learning about the natural world that is based on evidence and logic. Q: The term science comes from a latin word that means? Choices: - were knowledge - having information - only knowledge - having knowledge A:

Ans:having knowledge
Answer the following question given this paragraph: An individual is an organism, or single living thing. Q: What is the term for an organism, or single living thing? Choices: - single-celled organism - loner - unique - individual A:
individual