Science — English

What is the standard unit for measuring mass in the International System of Units?
The standard unit for measuring mass in the International System of Units (SI) is the kilogram, symbolized as kg. The...
Added: 08 Apr 2000
Updated: 06 Nov 2025
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What type of reaction releases energy, often in the form of heat and light?
A exothermic reaction is the type of reaction that releases energy, usually in the form of heat and light. Such...
Added: 08 Apr 2000
Updated: 29 Nov 2025
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What process allows for the conversion of a solid directly to a gas?
The process that allows a solid to convert directly to a gas is known as sublimation. In sublimation, a substance...
Added: 08 Apr 2000
Updated: 28 Nov 2025
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What type of reaction occurs when acids and bases combine?
When acids and bases combine, they undergo a neutralization reaction. This type of reaction typically produces water and a salt....
Added: 08 Apr 2000
Updated: 12 Nov 2025
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What is the main structure in plants that captures light for photosynthesis?
The main structure in plants that captures light for photosynthesis is the chloroplast. These organelles contain chlorophyll, a pigment that...
Added: 08 Apr 2000
Updated: 18 Nov 2025
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What natural process helps to regulate Earth's climate?
The natural process that helps to regulate Earth's climate is photosynthesis. Plants convert sunlight into energy, absorbing carbon dioxide and...
Added: 08 Apr 2000
Updated: 06 Nov 2025
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What type of ion has a positive charge?
An ion with a positive charge is referred to as a cation. Cations are formed when an atom loses one...
Added: 08 Apr 2000
Updated: 02 Nov 2025
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What is the term for the organ responsible for detoxifying drugs and metabolic waste?
The term for the organ responsible for detoxifying drugs and metabolic waste is the liver. It processes nutrients, produces vital...
Added: 08 Apr 2000
Updated: 16 Nov 2025
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What is the main energy molecule that fuels cellular activities?
The main energy molecule that fuels cellular activities is ATP, or adenosine triphosphate. It stores and transfers energy within cells,...
Added: 08 Apr 2000
Updated: 21 Nov 2025
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What type of force is demonstrated by gravity?
The type of force demonstrated by gravity is called a non-contact force. It acts at a distance, pulling objects toward...
Added: 08 Apr 2000
Updated: 07 Nov 2025
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What is the term for the reversal of a chemical reaction?
The term for the reversal of a chemical reaction is chemical equilibrium. In this state, the rates of the forward...
Added: 08 Apr 2000
Updated: 10 Nov 2025
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What is the name of the structure that separates the interior of a cell from its external environment?
The structure that separates the interior of a cell from its external environment is called the cell membrane. This semi-permeable...
Added: 08 Apr 2000
Updated: 27 Nov 2025
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What is the name of the reaction where glucose and oxygen produce carbon dioxide, water, and energy?
The reaction where glucose and oxygen produce carbon dioxide, water, and energy is known as cellular respiration. This process is...
Added: 08 Apr 2000
Updated: 26 Nov 2025
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What is the role of ATP in cellular activities?
ATP, or adenosine triphosphate, plays a vital role in cellular activities by serving as the primary energy currency of cells....
Added: 08 Apr 2000
Updated: 19 Nov 2025
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What is the term for the complex series of interdependent relationships in an ecosystem?
The term for the complex series of interdependent relationships in an ecosystem is called an ecological network. This network includes...
Added: 08 Apr 2000
Updated: 30 Nov 2025
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What is the primary principle of evolution proposed by Charles Darwin?
The primary principle of evolution proposed by Charles Darwin is natural selection. This principle suggests that organisms better adapted to...
Added: 08 Apr 2000
Updated: 15 Nov 2025
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How many chambers are in the human heart?
The human heart consists of four chambers: the left and right atria and the left and right ventricles. This chamber...
Added: 08 Apr 2000
Updated: 24 Nov 2025
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What chemical reaction is responsible for the escape of energy in exothermic reactions?
The chemical reaction responsible for the escape of energy in exothermic reactions is the combustion reaction. In these reactions, reactants...
Added: 08 Apr 2000
Updated: 23 Nov 2025
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What element is most abundant in the Earth’s crust?
The most abundant element in the Earth’s crust is oxygen. It comprises a major part of silicate and oxide minerals,...
Added: 08 Apr 2000
Updated: 08 Nov 2025
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What is the principle behind the lever in mechanics?
The principle behind the lever in mechanics is based on the concept of mechanical advantage, which allows a small force...
Added: 08 Apr 2000
Updated: 09 Nov 2025
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