Ques:Q: What type of carbons may be gases, liquids, or solids at room temperature? Read this paragraph and choose the correct option from the provided answers: Hydrocarbons vary greatly in size, which influences properties such as melting and boiling points. At room temperature, hydrocarbons may be gases, liquids, or solids. They are generally nonpolar and do not dissolve in water. Choices: - diamonds - amorphous - graphites - hydrocarbons A:

Ans:hydrocarbons
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Ques:Q: What is a combination of two or more substances in any proportions called? Read this paragraph and choose the correct option from the provided answers: A mixture is a combination of two or more substances in any proportions. The substances in a mixture do not combine chemically, so they retain their physical properties. Choices: - Combination - structure - mix - mixture A:

Ans:mixture
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Ques:Q: Abnormally high activity or low activity of the parathyroid gland can cause disorders related to levels of what bone mineral? Read this paragraph and choose the correct option from the provided answers: Abnormally high activity of the parathyroid gland can cause hyperparathyroidism, a disorder caused by an overproduction of PTH that results in excessive calcium reabsorption from bone. Hyperparathyroidism can significantly decrease bone density, leading to spontaneous fractures or deformities. As blood calcium levels rise, cell membrane permeability to sodium is decreased, and the responsiveness of the nervous system is reduced. At the same time, calcium deposits may collect in the body's tissues and organs, impairing their functioning. In contrast, abnormally low blood calcium levels may be caused by parathyroid hormone deficiency, called hypoparathyroidism, which may develop following injury or surgery involving the thyroid gland. Low blood calcium. Choices: - potassium - collagen - magnesium - calcium A:

Ans:calcium
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Ques:Q: What is a copy of an image formed by reflection or refraction? Read this paragraph and choose the correct option from the provided answers: A mirror is typically made of glass with a shiny metal backing that reflects all the light that strikes it. When a mirror reflects light, it forms an image. An image is a copy of an object that is formed by reflection or refraction. Mirrors may have flat or curved surfaces. The shape of a mirror's surface determines the type of image it forms. For example, some mirrors form real images, and other mirrors form virtual images. What's the difference between real and virtual images?. Choices: - an example - a photographic image - a mirror image - an image A:

Ans:
an image
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