Q: When salinity and pressure increase, or when temperature decreases, what happens to water density? Read this paragraph and choose the correct option from the provided answers: Water density increases as salinity and pressure increase, or as temperature decreases. Choices: - fluctuates - drops - stays the same - increases A:
increases

(Question)
Q: What do chemical reactions need to be activated? Read this paragraph and choose the correct option from the provided answers: Chemical reactions also need energy to be activated. They require a certain amount of energy just to get started. This energy is called activation energy . For example, activation energy is needed to start a car engine. Turning the key causes a spark that activates the burning of gasoline in the engine. The combustion of gas won't occur without the spark of energy to begin the reaction. Choices: - food - space - products - energy A:
(Answer)
energy

Ques: Q: Which cycle tracks the flow of nitrogen through an ecosystem? Read this paragraph and choose the correct option from the provided answers: Mariana Ruiz Villarreal (LadyofHats) for CK-12 Foundation. The nitrogen cycle tracks the flow of nitrogen through an ecosystem . CC BY-NC 3.0. Choices: - nitrogen reaction - water cycle - life cycle - nitrogen cycle A:
Ans: nitrogen cycle

(Q).
Q: The hardest natural substance, diamond is a form of what element? Read this paragraph and choose the correct option from the provided answers: Diamond is a form of carbon in which each carbon atom is covalently bonded to four other carbon atoms. This forms a strong, rigid, three-dimensional structure (see Figure below ). Diamond is the hardest natural substance, and no other natural substance can scratch it. This property makes diamonds useful for cutting and grinding tools as well as for rings and other jewelry (see Figure below ). Choices: - zirconium - zenon - hydrogen - carbon A:
(A).
carbon

Ques:Q: The three layers of protective coverings of the spinal cord is called what? Read this paragraph and choose the correct option from the provided answers: 35.3 | The Central Nervous System By the end of this section, you will be able to: Identify the spinal cord, cerebral lobes, and other brain areas on a diagram of the brain Describe the basic functions of the spinal cord, cerebral lobes, and other brain areas The central nervous system (CNS) is made up of the brain, a part of which is shown in Figure 35.19 and spinal cord and is covered with three layers of protective coverings called meninges (from the Greek word for membrane). The outermost layer is the dura mater (Latin for "hard mother"). As the Latin suggests, the primary function for this thick layer is to protect the brain and spinal cord. The dura mater also contains vein-like structures that carry blood from the brain back to the heart. The middle layer is the web-like arachnoid mater. The last layer is the pia mater (Latin for "soft mother"), which directly contacts and covers the brain and spinal cord like plastic wrap. The space between the arachnoid and pia maters is filled with cerebrospinal fluid (CSF). CSF is produced by a tissue called choroid plexus in fluid-filled compartments in the CNS called ventricles. The brain floats in CSF, which acts as a cushion and shock absorber and makes the brain neutrally buoyant. CSF also functions to circulate chemical substances throughout the brain and into the spinal cord. Choices: - dermis - tendons - muscles - meninges A:

Ans:meninges

Ques:Q: A machine is any device that makes work easier by doing what? Read this paragraph and choose the correct option from the provided answers: A machine is any device that makes work easier by changing a force. When you use a machine, you apply force to the machine. This force is called the input force. The machine, in turn, applies force to an object. This force is called the output force. Recall that work equals force multiplied by distance:. Choices: - moving things - changing molecules - removing barriers - changing a force A:

Ans:
changing a force