The sound is an external factor that affects the ear, causing the sense of hearing. It is produced due to the vibration of the bodies, and it stops when the vibrating bodies stop their...
The organism’s body must be buried immediately after death in a medium that preserves it from decomposition. The organism must have a hard skeleton. A suitable medium must be found in which the mineral...
Fossils are the traces and the remains of living organisms that are preserved in the sedimentary rocks. The traces of once old living organisms indicate their activity during their life, and the remains are...
Water pollution is the addition of any water substance that causes a gradual, continuous change in water properties and affects the health and life of living creatures. Drinking water does not depend on its colour or...
