104 questions and answers in this section

Natural Sciences » Biology

Explain why eggshells are porous.

Explain why eggshells are porous.

If you look closely at an eggshell, you'll quickly notice that it is not as smooth as it appears. Under a microscope, it looks like...

Read full answer

Explain why ants form colonies with well-defined roles?

Explain why ants form colonies with well-defined roles?

Ant colonies follow a very structured organization, with the queen at the top. She is responsible for reproduction and lays eggs continuously, ensuring the colony's...

Read full answer

Explain why bats are the only mammals capable of sustained flight?

Explain why bats are the only mammals capable of sustained flight?

The wings of bats are unique: they are made of a flexible skin membrane called patagium, stretched between super long and thin fingers like needles. These extended...

Read full answer

Explain why we squint in bright sunlight to see better?

Explain why we squint in bright sunlight to see better?

When you squint, it is mainly the muscles around the eyelids that come into play, especially the orbicularis oculi muscle. This circular muscle contracts gently...

Read full answer

Explain why pasteurized milk lasts longer than raw milk.

Explain why pasteurized milk lasts longer than raw milk.

Pasteurization is a simple thermal treatment that allows, by rapidly heating milk to a temperature generally between 72°C and 85°C for a few seconds, to...

Read full answer

Explain why one cannot tickle oneself?

Explain why one cannot tickle oneself?

Tickling activates several regions of the brain, notably the somatosensory cortex, responsible for the perception of touch, and the anterior cingulate cortex, linked to emotional...

Read full answer

Explain why are the shells of mollusks so hard?

Explain why are the shells of mollusks so hard?

The hardness of shells is not just for aesthetics. In mollusks, it primarily serves as a protective shield against predators, such as crabs or birds, that would...

Read full answer

Explain why the beard grows faster in some men?

Explain why the beard grows faster in some men?

Beard growth depends heavily on hormones, particularly a derivative of testosterone called dihydrotestosterone (DHT). The more DHT you have, the more your facial hair is...

Read full answer

Explain why we feel dizzy when leaning over the edge of a balcony?

Explain why we feel dizzy when leaning over the edge of a balcony?

In your inner ear, you have an organ called the vestibular system. It tells you if you tilt your head, move, or lose your balance. It works...

Read full answer

Explain why reptiles have scales while mammals have hair?

Explain why reptiles have scales while mammals have hair?

The scales of reptiles and the hair of mammals do not come from the same place on the evolutionary tree. The scales of reptiles appeared...

Read full answer