*Question*
Q: The abundance of this substance in the atmosphere is what most scientist agree that is causing global warming? Read this paragraph and choose the correct option from the provided answers: Most scientists agree that global warming is caused by more carbon dioxide in the atmosphere (see Figure below ). This increases the greenhouse effect. There is more carbon dioxide mainly because of the burning of fossil fuels. Destroying forests is another cause. With fewer forests, less carbon dioxide is removed from the atmosphere by photosynthesis. Choices: - argon - iron oxide - liquid dioxide - carbon dioxide A:
**Answer**
carbon dioxide

*Question*
Q: Displacement, velocity, acceleration, and force are examples of what type of quantity that has magnitude and direction? Read this paragraph and choose the correct option from the provided answers: Vectors in Two Dimensions A vector is a quantity that has magnitude and direction. Displacement, velocity, acceleration, and force, for example, are all vectors. In one-dimensional, or straight-line, motion, the direction of a vector can be given simply by a plus or minus sign. In two dimensions (2-d), however, we specify the direction of a vector relative to some reference frame (i. , coordinate system), using an arrow having length proportional to the vector's magnitude and pointing in the direction of the vector. Figure 3.9 shows such a graphical representation of a vector, using as an example the total displacement for the person walking in a city considered in Kinematics in Two Dimensions: An Introduction. We shall use the notation that a boldface symbol, such as D , stands for a vector. Its magnitude is represented by the symbol in italics, D , and its direction by . Vectors in this Text In this text, we will represent a vector with a boldface variable. For example, we will represent the quantity force with the vector F , which has both magnitude and direction. The magnitude of the vector will be represented by a variable in italics, such as. Choices: - cycles - wave - frequency - vector A:
**Answer**
vector

*Question*
Q: The soil beneath a deciduous forest is called what? Read this paragraph and choose the correct option from the provided answers: The soil beneath a deciduous forest is a pedalfer. These soils are very fertile. Choices: - cocklebur - forest floor - trichina - pedalfer A:
**Answer**
pedalfer

*Question*
Q: Nerves of the hands, arms, feet, legs, and trunk are part of what system? Read this paragraph and choose the correct option from the provided answers: There are other nerves in your body that are not found in the brain or spinal cord. The peripheral nervous system (PNS) ( Figure below ) contains all the nerves in the body that are found outside of the central nervous system. They include nerves of the hands, arms, feet, legs, and trunk. They also include nerves of the scalp, neck, and face. Nerves that send and receive messages to the internal organs are also part of the peripheral nervous system. Choices: - urinary system - circulatory system - cardiovascular system - peripheral nervous system A:
**Answer**
peripheral nervous system