Science — English

What is the role of freshwater ecosystems in global water cycles?
Freshwater ecosystems play a critical role in global water cycles by contributing to evaporation, precipitation, and water storage. They filter...
Added: 06 Mar 2000
Updated: 12 Nov 2025
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What is the name given to the study of the relationships between living organisms and their environment?
The study of the relationships between living organisms and their environment is known as ecology. Ecology examines interactions between organisms...
Added: 06 Mar 2000
Updated: 17 Nov 2025
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What was the first antibiotic discovered in the 20th century?
The first antibiotic discovered in the 20th century was penicillin. Discovered by Alexander Fleming in 1928, penicillin is derived from...
Added: 06 Mar 2000
Updated: 28 Nov 2025
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Which organelle is responsible for photosynthesis in plant cells?
The organelle responsible for photosynthesis in plant cells is the chloroplast. Chloroplasts contain chlorophyll, a green pigment essential for capturing...
Added: 06 Mar 2000
Updated: 25 Nov 2025
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What process do scientists use to generate hypotheses and conduct experiments?
The process scientists use to generate hypotheses and conduct experiments is known as the scientific method. This systematic approach includes...
Added: 06 Mar 2000
Updated: 23 Nov 2025
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What biological molecule serves as the blueprint for life?
The biological molecule that serves as the blueprint for life is DNA (deoxyribonucleic acid). DNA carries the genetic information necessary...
Added: 06 Mar 2000
Updated: 04 Nov 2025
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What is the term for the process by which water vapor cools and forms clouds?
The term for the process by which water vapor cools and forms clouds is called condensation. When warm, moist air...
Added: 06 Mar 2000
Updated: 17 Nov 2025
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Which type of energy is released during nuclear fission reactions?
The type of energy released during nuclear fission reactions is nuclear energy. During fission, the nucleus of an atom splits...
Added: 06 Mar 2000
Updated: 06 Nov 2025
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What is the natural phenomenon that causes the Earth's magnetic field?
The natural phenomenon that causes the Earth's magnetic field is the motion of molten iron and nickel in the outer...
Added: 06 Mar 2000
Updated: 29 Nov 2025
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What type of waves are used in medical imaging techniques like ultrasound?
The type of waves used in medical imaging techniques like ultrasound are sound waves. Ultrasound imaging employs high-frequency sound waves...
Added: 06 Mar 2000
Updated: 14 Nov 2025
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What theory proposes that the continents were once part of a single landmass?
The theory that proposes the continents were once part of a single landmass is known as continental drift. Proposed by...
Added: 06 Mar 2000
Updated: 13 Nov 2025
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What type of cell is responsible for transmitting nerve impulses?
The type of cell responsible for transmitting nerve impulses is a neurons. Neurons transmit information throughout the body via electrical...
Added: 06 Mar 2000
Updated: 08 Nov 2025
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What is the main source of energy for life on Earth?
The main source of energy for life on Earth is solar energy, derived from the sun. Through the process of...
Added: 06 Mar 2000
Updated: 30 Nov 2025
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What is the name of the enzyme that catalyzes the breakdown of starch?
The enzyme that catalyzes the breakdown of starch is called amylase. Amylase is produced in the salivary glands and pancreas...
Added: 06 Mar 2000
Updated: 03 Nov 2025
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Which molecule is essential for the synthesis of proteins in cells?
The molecule essential for the synthesis of proteins in cells is messenger RNA (mRNA). During the process of transcription, DNA...
Added: 06 Mar 2000
Updated: 12 Nov 2025
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What is the primary driver of plate tectonics?
The primary driver of plate tectonics is the heat generated from the Earth's core, which causes convection currents in the...
Added: 06 Mar 2000
Updated: 14 Nov 2025
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Which phenomenon explains the exchange of gases during respiration in animals?
The phenomenon that explains the exchange of gases during respiration in animals is called diffusion. In this process, oxygen from...
Added: 06 Mar 2000
Updated: 27 Nov 2025
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What is the main distinction between prokaryotic and eukaryotic cells?
The main distinction between prokaryotic and eukaryotic cells is the presence of a nucleus and membrane-bound organelles. Prokaryotic cells, such...
Added: 06 Mar 2000
Updated: 28 Nov 2025
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What is the significance of the pH scale in chemistry?
The significance of the pH scale in chemistry lies in its measure of the hydrogen ion concentration in a solution,...
Added: 06 Mar 2000
Updated: 17 Nov 2025
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What is the term for a change in the genetic sequence of an organism?
The term for a change in the genetic sequence of an organism is called a mutation. Mutations can occur naturally,...
Added: 06 Mar 2000
Updated: 10 Nov 2025
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