1295 questions and answers in this section
Explain why do some orchid flowers resemble insects?

Explain why do some orchid flowers resemble insects?

Natural selection has driven certain orchids to take on the appearance of insects to better attract their pollinators. These orchids, unable to produce nectar, must...

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Explain why is the Gulf Stream current crucial for the European climate?

Explain why is the Gulf Stream current crucial for the European climate?

The Gulf Stream originates in the warm waters of the Gulf of Mexico, where the sun shines brightly and warms the sea. Driven mainly by...

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Explain why natural hot spring water is often rich in minerals?

Explain why natural hot spring water is often rich in minerals?

Natural hot springs primarily occur when rainwater or meltwater seeps into the ground, descends deep, and then heats up in contact with areas of geothermal...

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Explain why do some crystals change color when exposed to light?

Explain why do some crystals change color when exposed to light?

When light touches a crystal, certain electrons absorb specific colors (certain wavelengths, that is). They capture the light energy and jump to a higher level, entering an...

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Explain why do some trees live for hundreds of years?

Explain why do some trees live for hundreds of years?

To last so long, some trees rely on specialized and constantly active cells, grouped in specific areas called meristems. These meristems regularly renew damaged tissues, much like...

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Explain why do schools of fish move in perfect coordination?

Explain why do schools of fish move in perfect coordination?

Fish exchange information through quick visual signals and subtle changes in movement. If one turns sharply, its neighbors immediately pick up on this impulse and...

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Explain why do we get sick more often in winter?

Explain why do we get sick more often in winter?

In winter, several viruses, including those of the flu and the cold, survive longer in cold, dry air, making their spread more efficient. The cool...

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Explain why is Mount Everest nicknamed the roof of the world?

Explain why is Mount Everest nicknamed the "roof of the world"?

The expression "roof of the world" is not a recent term: it actually comes from the Sanskrit term "Sagarmatha," which roughly means "front (or head)...

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Explain why are some stars called white dwarfs?

Explain why are some stars called white dwarfs?

Historically, the term white dwarf dates back to the early 20th century, when astronomers discovered very small but very bright stars of white color. They...

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Explain why limestone caves often have underground rivers.

Explain why limestone caves often have underground rivers.

Limestone is a sedimentary rock primarily composed of calcium carbonate, often derived from the remains of dead marine organisms accumulated on the sea floor a...

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