Biology

A:

The tail of a dog is an extension of its spine and is composed of individual bony segments called vertebrae. A tail may contain from six to 23 vertebrae.

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  • What Is the Source of Silk?

    Q: What Is the Source of Silk?

    A: Silk comes from the cocoons of certain insects, such as the mulberry silkworm. When the insects create their cocoons, harvesters extract the fibers and spin them into thread. Each cocoon may contain more than 1,000 yards of fibers, but it takes several to create thread strong enough to make cloth.
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  • What Are Some Animals With Names Beginning With the Letter "Q"?

    Q: What Are Some Animals With Names Beginning With the Letter "Q"?

    A: There are several animals that have names that begin with the letter "q," including the quail, the quarterhorse and the quoll. Lesser known animals, like the queen snake, the quokka and the quetzal also have names beginning with this not-so-often-used letter.
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  • What Are the Parts of a Mushroom?

    Q: What Are the Parts of a Mushroom?

    A: The parts of the mushroom are the cap, gills or pores, spores, stem, ring, volva, mycelium and hypha. The mushroom can be divided into underground and aboveground sections.
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  • What Are the Four Ways That Pathogens Are Spread?

    Q: What Are the Four Ways That Pathogens Are Spread?

    A: The Association of the British Pharmaceutical Industry states that four ways pathogens are spread are by droplet infection, direct contact, bodily fluids and vectors. Pathogens can also be spread via contaminated food and water.
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  • What Causes an Enlarged Thyroid?

    Q: What Causes an Enlarged Thyroid?

    A: An enlarged thyroid gland can be caused by an iodine deficiency, Grave's disease or Hashimoto's disease, according to the Mayo Clinic. Other possible causes include thyroid nodules, pregnancy and thyroid cancer.
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  • Why Is It Important for Organisms to Maintain Homeostasis?

    Q: Why Is It Important for Organisms to Maintain Homeostasis?

    A: Homeostasis is the process through which an organism maintains certain internal conditions, such as a human body's internal mechanisms maintaining body temperature at a specific level to prevent over or under heating; this process is important because it makes it possible for cells and organs to function properly. For example, certain parts of the human body cease to function if they become too hot or too cold; this is why it is possible for people to freeze to death or die from overheating.
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  • What Do Photosynthesis and Respiration Have in Common?

    Q: What Do Photosynthesis and Respiration Have in Common?

    A: Photosynthesis and respiration are complementary processes that both involve carbon dioxide, water, glucose and oxygen, and this is what they have in common. Essentially, they are the same reactions, although the reactions occur in reverse. Photosynthesis converts water and carbon dioxide into glucose and oxygen, while respiration converts glucose and oxygen into carbon dioxide and water.
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  • Why Are Buffers Important to Living Organisms?

    Q: Why Are Buffers Important to Living Organisms?

    A: Buffers are an important part of the biochemical processes of living things because they help keep the pH within organisms' body stable. Most biochemical reactions that are essential for life only take place in a narrow pH range. The presence of buffers ensures that the body's pH remains in this range, despite changes in the surroundings.
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  • What Is the Definition of Fungi?

    Q: What Is the Definition of Fungi?

    A: The fungi are a kingdom in the eukaryote domain. Fungi are important decomposers in all ecosystems because they can break down a wide variety of organic matter. Lignin, a component of wood, would not get broken down without fungal decomposers, so the nutrients would not be recycled.
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  • What Phylum Do Humans Belong To?

    Q: What Phylum Do Humans Belong To?

    A: Humans belong to the phylum Chordata. Humans are part of this phylum, because they have a notochord when they are in the womb; this notochord will eventually turn into a spinal cord.
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  • How Do Protists Affect Humans?

    Q: How Do Protists Affect Humans?

    A: Protists are primitive single-celled organisms, some of which cause human diseases. According to the Centers for Disease Control and Prevention, four basic types of protozoans afflict humans, which are classified in the groups Sarcodina, Mastigophora, Ciliophora and Sporozoa.
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  • How Does Algae Form?

    Q: How Does Algae Form?

    A: Algae are a type of plant that usually grows on the surface of still water, such as a small pond, when there is an ecological imbalance. In some cases, algae is able to grow at a rapid rate, potentially spreading across the entire surface.
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  • How Are Bacteria Different From Animal and Plant Cells?

    Q: How Are Bacteria Different From Animal and Plant Cells?

    A: Plants and animals are multi-cellular organisms composed of eukaryotic cells, while bacteria are single-cell prokaryotic organisms. Each eukaryotic cell of a plant or animal includes a central nucleus containing DNA and membrane-bound organelles, such as endoplasmic reticulum and mitochondria. A bacterial cell has no nucleus or membrane-bound organelles.
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  • What Are the Nonliving Parts of an Ecosystem Called?

    Q: What Are the Nonliving Parts of an Ecosystem Called?

    A: Nonliving parts of an ecosystem are called abiotic components or abiotic factors. These include parts of the ecosystem that are non-living but still affect it. Examples include water, soil, air, temperature and sunlight.
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  • Which Animal Has the Longest Tail?

    Q: Which Animal Has the Longest Tail?

    A: According to Newton's Apple, the animal with the longest tail is the male giraffe, or the Giraffa camelopardalis. The people of ancient Rome called this species the camel-leopard. This animal's tail can grow as long as 8 feet in length.
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  • What Does Catalase Do?

    Q: What Does Catalase Do?

    A: Catalase is an enzyme found in organisms exposed to oxygen. It breaks down hydrogen peroxide into water and oxygen, according the Encyclopedia Britannica. It is found in large amounts in the tissues of mammals, and it helps prevent damage to tissues from peroxide, which is a byproduct of many metabolic reactions.
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  • Why Is Water so Important?

    Q: Why Is Water so Important?

    A: Water is important because the human body has a drought management system that prevents dehydration and water is the most crucial part of that system. Water also helps regulate body temperature, serves as a lubricant and is a natural headache remedy (headaches can be a sign of dehydration).
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  • What Is the Ultimate Source of Energy for All Life on Earth?

    Q: What Is the Ultimate Source of Energy for All Life on Earth?

    A: The ultimate source of energy for all life on Earth is the sun. Every form of life on Earth is dependent upon others, and without sunlight, most life on Earth would cease to exist rather quickly.
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  • How Does a Volvox Eat?

    Q: How Does a Volvox Eat?

    A: The volvox primarily eats through photosynthesis. Individual cells within the organism contain a red eyespot and, along with chloroplasts, make food from sunlight.
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  • What Are the Negative and Positive Effects of Urbanization?

    Q: What Are the Negative and Positive Effects of Urbanization?

    A: Some benefits of urbanization are economies of scale, better transportation, better opportunities for housing and education, better medical care, increased job opportunities and greater access to goods. However, urbanization also has some negative effects, such as traffic, violence, increased pollution, diseases and physical inactivity.
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  • What Is Reverse Osmosis?

    Q: What Is Reverse Osmosis?

    A: Reverse osmosis occurs when concentrated water is pushed through a membrane to produce fresh water on the other side, according to About.com chemistry section. Reverse osmosis allows water molecules to pass from concentrated solutions to make fresh water, and it keeps foreign particles at bay.
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