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Answer the following question given this paragraph: Sperm leave the epididymis through the vas deferens. As they travel through the vas deferens, they pass by the prostate and other glands. The sperm mix with secretions from these glands, forming semen. Semen travels through the urethra and leaves the body through the penis. A teaspoon of semen may contain as many as half a billion sperm!. Q: What is formed when sperm mixes with secretions from the various other glands of the reproductive system? Choices: - testosterone - urine - hormone - semen A:
(Answer)
semen

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Answer the following question given this paragraph: An example of a physical model is a drawing of the layers of Earth ( Figure below ). A drawing helps us to understand the structure of the planet. Yet there are many differences between a drawing and the real thing. The size of a model is much smaller, for example. A drawing also doesn't give good idea of how substances move. Arrows showing the direction the material moves can help. A physical model is very useful but it can't explain the real Earth perfectly. Q: What was diorite commonly used for in ancient civilizations? Choices: - school - currency - medicine - art A:
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art

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Answer the following question given this paragraph: 3.1 | Synthesis of Biological Macromolecules By the end of this section, you will be able to: Understand the synthesis of macromolecules Explain dehydration (or condensation) and hydrolysis reactions As you've learned, biological macromolecules are large molecules, necessary for life, that are built from smaller organic molecules. There are four major classes of biological macromolecules (carbohydrates, lipids, proteins, and nucleic acids); each is an important cell component and performs a wide array of functions. Combined, these molecules make up the majority of a cell's dry mass (recall that water makes up the majority of its complete mass). Biological macromolecules are organic, meaning they contain carbon. In addition, they may contain hydrogen, oxygen, nitrogen, and additional minor elements. Q: The four major classes of biological macromolecules include carbohydrates, lipids, proteins, and what else? Choices: - liquids - fats - structural acids - nucleic acids A:
(Answer)
nucleic acids