What Is the Role of Bacteria in Nature?
Bacteria were among the first life forms to appear on Earth, and are present in most of its habitats. Bacteria are minute organis
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Cell
Why Do Animals Need Oxygen?
Why Do Animals Need Oxygen? We must have oxygen to live. Every living animal cell needs oxygen for its vital metabolic activities (the proce
What Is a Cell Phone, Who Invented It?
What Is a Cell Phone, Who Invented It? Cellular telephone is a type of short-wave analog or digital telecommunication in which a subscriber
How Does a Tree Make Sap?
Sap is the liquid that flows through trees and other plants and helps them live and grow. The roots of a tree draw from the soil a combinati
How Does a Smoke Detector Work?
How Does a Smoke Detector Work? There are two basic kinds of smoke detectors: ionization detectors and photoelectric detectors. A smoke alar