Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Human Population-Historical Overview
Throughout history, the human population has been quite small. It has grown relatively slowly and even experienced occasional declines. Figure shows the general trend of population growth in the last half million years. As said earlier, the dawn of agriculture, triggered a series of major global environmental changes.
Figure: Human Population
As agriculture became more efficient, women began to bear more children and the human population increased. It was possible to grow more food in a given area of land. Hunter-gatherers were mostly nomadic and in their way of life, infants were a liability as children could not become very good hunters. Whereas, in a stationary agricultural society, babies are not much trouble and children can help in the farm. Therefore, the population increase between 10,000 BC and about 1800 AD was largely the result of increasing birth rates that coincided with the growth of agriculture.
#questitypes of plant breeding on..
Glucose is a six-carbon single sugar; It is the most common energy source.
Q. What are the enzymes? What is the significance of enzymes for living beings? Enzymes are proteins that are catalysts of the chemical reactions. From Chemistry it is known as
Define Food availability and Food Access? Food availability: This refers to availability of necessary types of food in sufficient quantity, to the individual. The sources may b
Forebrain 1 . OLFACTORY LOBES - 1 pair, very small, solid, club shaped, separated from each other. Fully covered by cerebral hemispheres on dorsal side, clear on
Q. What are melanocytes? Melanocytes are epithelial cells of the skin specialized in secretion of melanin and Melanin is a pigment that besides coloring the iris of the eye and
Water Water is the most important constituent of all living tissue. It forms up to 95% of the fresh weight of some animals. We all know that water is lost through sweat, excre
Check Screws- Check screw access holes for closure. If screw access holes are uncovered, such as the bar-retained dentures, make sure that are free from debris. If screws can b
Explain the different types of cells in cell structure ? Types of Cells : Cells can be classified as being either prokaryotic or eukaryotic depending on whether or not a mem
Q. What are the main human diseases caused by prions? The major known human diseases of such type are the Creutzfeldt-Jacob disease (CJD), the kuru and the Gerstmann-Sträussle-
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd