There are several components of environment, which are created by man. Environment is a totality of natural plus man made environment, the latter including crop fields, cities, industrial space etc. these are the places, which are artificially made by man by planned manipulation.
There are various types of trunk calls like ordinary calls, urgent calls, lightning calls, reversed charge calls, press trunk calls and fixed time calls.
Man is the most dominant and capable organism who can influence and alter his habitats. Various human activities have posed problems to other organisms in the same manner as the over dominance of a tiger in a forest would do to deer and zebras.
20 essential facts about various man made materials. A mixture of clay and limestone is heated in a kiln to make cement. Concrete is made by mixing cement, sand, gravel and water. Concrete is made by mixing cement, sand, gravel and water.