Diseases like dysentry, cholera, typhoid, etc. are more common in over-crowded human settlements. Why?

Cholera, typhoid and jaundice are the diseases caused by-

What are Dryopithecines? Why are these considered to be common ancestors of both apes and human?

Why cross breeds are more advantageous over indigenous breeds ?

Animal husbandry is the science of rearing, feeding, caring, breeding a disease control of animals. It ensures supply of proper nutrition to our growing population through activities like increased production and Improvement of animal products like milk, eggs, meat, honey etc. Crossbreeds of cattle are more advantageous than the indigenous breeds.

Animal husbandry is the science of rearing, feeding, caring, breeding a disease control of animals. It ensures supply of proper nutrition to our growing population through activities like increased production and Improvement of animal products like milk, eggs, meat, honey etc. Polyculture of fishes is of great importance.

Take a rectangular sheet (like a post - card) .fold it once length wise so that one half fits exactly over the other half . Is this fold a line of symmetry . Why ?

Climate refers to the physical environmental factors of an area. These include duration and intesity of light, temperature, humidity, wind, gases, etc. The climate change refers to the changes in these environmental factors of an area over long eriod of time. Main culprit of such climatic change is man himself as his activities are adversely affecting the delicate ecological balance between various components of the environment. Answer the following questions regarding climate change. Problem of global warming is increasing with time. Why?

Veracular names given to the organisms in a particular language and region of the world. There are several types of names like English, Hindi, Gujrati, Marathi, Bengali, Tamil, etc. The names have been in use since times immemorial. New names are added whenever outside organisms are introduced into the area. Why veracular names can not be used by biologists? Give two reasons.