Jun 13, 2026Elias Ntezimana
The nervous system is a complex network of organs and cells that controls, coordinates, and regulates all activities of the body.
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Jun 13, 2026Elias Ntezimana
A food chain is a sequence of organisms through which energy and nutrients pass from one living organism to another in an ecosystem
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Jun 13, 2026Elias Ntezimana
Hormones are chemical messengers produced by endocrine glands. They regulate and coordinate many essential functions of the human body.
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Jun 13, 2026Elias Ntezimana
Hereditary diseases are disorders caused by genetic abnormalities that are transmitted from one generation to the next through inheritance
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Jun 12, 2026Elias Ntezimana
The origin of life is one of the most important questions in biology. Scientists have proposed several theories to explain how life first appeared on Earth about 3.5 to 4 billion years ago.
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Jun 12, 2026Elias Ntezimana
A genetic mutation is a permanent change in the DNA sequence of an organism. Mutations are responsible for genetic variation and play a crucial role in evolution, adaptation, and sometimes disease
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Jun 12, 2026Elias Ntezimana
The cell is the smallest living unit capable of performing all the functions necessary for life. Every living organism, from microscopic bacteria to large animals and plants, is composed of one or more cells.
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Jun 11, 2026Elias Ntezimana
Radioactivity is a natural phenomenon in which unstable atomic nuclei emit radiation and transform into more stable forms. It has played a major role in the development of modern science, medicine, industry, and energy production.
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Jun 08, 2026Elias Ntezimana
When the human body faces danger or stress, it activates a rapid biological response controlled mainly by two key hormones.
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