Science — English

What is the main source of energy for the Earth's ecosystem?
The main source of energy for the Earth's ecosystem is solar energy. The sun's light is harnessed by plants through...
Added: 17 Apr 2000
Updated: 23 Nov 2025
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What is the term for an organism's ability to adapt to its environment over time?
The term for an organism's ability to adapt to its environment over time is evolution. Evolutionary changes occur through genetic...
Added: 17 Apr 2000
Updated: 19 Nov 2025
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Which hormone is primarily responsible for regulating metabolism in humans?
The hormone primarily responsible for regulating metabolism in humans is thyroxine, produced by the thyroid gland. Thyroxine plays a crucial...
Added: 17 Apr 2000
Updated: 30 Nov 2025
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What is the name of the instrument used to observe celestial objects?
The instrument used to observe celestial objects is called a telescope. Telescopes can be optical, using lenses or mirrors to...
Added: 17 Apr 2000
Updated: 04 Nov 2025
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What element is essential for the formation of hemoglobin in red blood cells?
The element essential for the formation of hemoglobin in red blood cells is iron. Hemoglobin is a protein that carries...
Added: 17 Apr 2000
Updated: 07 Nov 2025
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What type of cell division results in genetically identical daughter cells?
The type of cell division that results in genetically identical daughter cells is called mitosis. This process is essential for...
Added: 17 Apr 2000
Updated: 11 Nov 2025
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What is the process of converting a solid directly into a gas without passing through the liquid state called?
The process of converting a solid directly into a gas without passing through the liquid state is called sublimation. This...
Added: 17 Apr 2000
Updated: 09 Nov 2025
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What is the key principle of the theory of evolution by natural selection?
The key principle of the theory of evolution by natural selection is that individuals with favorable traits are more likely...
Added: 17 Apr 2000
Updated: 02 Nov 2025
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In chemistry, what is the term for the molecular arrangement of a solid?
In chemistry, the term for the molecular arrangement of a solid is called its crystal structure. This arrangement determines the...
Added: 17 Apr 2000
Updated: 21 Nov 2025
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What type of organism is typically found at the start of a food chain?
The type of organism typically found at the start of a food chain is called a producer. Producers, primarily plants...
Added: 17 Apr 2000
Updated: 01 Dec 2025
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What is the term for the gradual change in the characteristics of a species over time?
The term for the gradual change in the characteristics of a species over time is evolution. This process is driven...
Added: 17 Apr 2000
Updated: 15 Nov 2025
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What is the chief function of the mitochondria in cells?
The chief function of the mitochondria in cells is to generate ATP through cellular respiration. Often referred to as the...
Added: 17 Apr 2000
Updated: 25 Nov 2025
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What type of bond is formed when electrons are transferred from one atom to another?
The type of bond formed when electrons are transferred from one atom to another is called an ionic bond. In...
Added: 17 Apr 2000
Updated: 01 Dec 2025
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What is the scientific term for the Earth's outermost layer?
The scientific term for the Earth's outermost layer is the crust. This solid layer is composed of rock and forms...
Added: 17 Apr 2000
Updated: 29 Nov 2025
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What type of energy is associated with an object’s position within a gravitational field?
The type of energy associated with an object’s position within a gravitational field is known as gravitational potential energy. This...
Added: 17 Apr 2000
Updated: 01 Dec 2025
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What phenomenon allows birds to migrate long distances using Earth's magnetic field?
The phenomenon that allows birds to migrate long distances using Earth's magnetic field is called magnetoreception. Birds have specialized receptors...
Added: 17 Apr 2000
Updated: 18 Nov 2025
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Which part of the ear is responsible for balance?
The part of the ear responsible for balance is the vestibular system, which consists of structures in the inner ear,...
Added: 17 Apr 2000
Updated: 29 Nov 2025
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What is the primary type of sugar used by cells for energy?
The primary type of sugar used by cells for energy is glucose. This simple sugar plays a critical role in...
Added: 17 Apr 2000
Updated: 01 Dec 2025
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What is the process by which solid ice transforms directly into vapor called?
The process by which solid ice transforms directly into vapor is called sublimation. This transition occurs without passing through the...
Added: 17 Apr 2000
Updated: 08 Nov 2025
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What term describes a biological community and its environment interacting as a system?
A biological community and its environment interacting as a system is described by the term ecosystem. Ecosystems encompass the relationships...
Added: 17 Apr 2000
Updated: 11 Nov 2025
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