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Africa is a tremendous continent, measuring nearly 5,000 miles from north to south and the same from the western edge at 20° north latitude to the eastern "horn". It comprises over 20% of the earth's land surface. Throughout the manuscript we shall discuss Africa under the subdivisions listed below.

Northeast africa

This area includes present day Egypt, Sudan, Ethiopia and Somalia. It has about 2,000,000 square miles and is a region where Hamitic and Semitic Caucasoids have met and merged with Negroid stock. Many of the Negroids seem different than other black Africans and some authorities believe them to be a separate race, as for example – the Masai. (Ref. 83 ). In ancient times part of Ethiopia (Abyssinia) was known as Axum, while portions of the Sudan have been known as Kush and Nubia. The Nile River runs through all of these countries with the exception of Somalia.

North central and northwest

This area includes present day Libya, Tunisia, Algeria, Morocco and a large part of the Sahara Desert. Overall there are nearly 3,000,000 square miles and the majority of the present population is descendant from the original inhabitants, as no invader ever brought many individuals to the area. Even the great Arab waves of the 7th and 8th centuries probably involved less than 200,000 people. The Berbers are a Caucasoid type, but with much physical variation from tribe to tribe. They inhabit most of the coastal region, much of the mountainous country and the oases. The basic population of the Sahara proper, particularly its more southern portions, was and is today basically Negroid, some native and some descended from slaves. (Ref. 83 ).

Sub-saharan africa

This area extends from far west Africa across the Sudanic plain as far east as the Lake Chad environs, then down to the equatorial district as well as central, east and south Africa and the major islands. This very large spread of land has many and varied peoples and cultures, but historical material is still relatively meager for most of it and from the standpoint of manuscript space, it seems best to consider it under one section.

Africa

    Choose different region

  • America
  • Central and Northern Asia
  • Europe
  • The Far East
  • The Indian Subcontinent
  • The Near East
  • Pacific

Questions & Answers

how does Neisseria cause meningitis
Nyibol Reply
what is microbiologist
Muhammad Reply
what is errata
Muhammad
is the branch of biology that deals with the study of microorganisms.
Ntefuni Reply
What is microbiology
Mercy Reply
studies of microbes
Louisiaste
when we takee the specimen which lumbar,spin,
Ziyad Reply
How bacteria create energy to survive?
Muhamad Reply
Bacteria doesn't produce energy they are dependent upon their substrate in case of lack of nutrients they are able to make spores which helps them to sustain in harsh environments
_Adnan
But not all bacteria make spores, l mean Eukaryotic cells have Mitochondria which acts as powerhouse for them, since bacteria don't have it, what is the substitution for it?
Muhamad
they make spores
Louisiaste
what is sporadic nd endemic, epidemic
Aminu Reply
the significance of food webs for disease transmission
Abreham
food webs brings about an infection as an individual depends on number of diseased foods or carriers dully.
Mark
explain assimilatory nitrate reduction
Esinniobiwa Reply
Assimilatory nitrate reduction is a process that occurs in some microorganisms, such as bacteria and archaea, in which nitrate (NO3-) is reduced to nitrite (NO2-), and then further reduced to ammonia (NH3).
Elkana
This process is called assimilatory nitrate reduction because the nitrogen that is produced is incorporated in the cells of microorganisms where it can be used in the synthesis of amino acids and other nitrogen products
Elkana
Examples of thermophilic organisms
Shu Reply
Give Examples of thermophilic organisms
Shu
advantages of normal Flora to the host
Micheal Reply
Prevent foreign microbes to the host
Abubakar
they provide healthier benefits to their hosts
ayesha
They are friends to host only when Host immune system is strong and become enemies when the host immune system is weakened . very bad relationship!
Mark
what is cell
faisal Reply
cell is the smallest unit of life
Fauziya
cell is the smallest unit of life
Akanni
ok
Innocent
cell is the structural and functional unit of life
Hasan
is the fundamental units of Life
Musa
what are emergency diseases
Micheal Reply
There are nothing like emergency disease but there are some common medical emergency which can occur simultaneously like Bleeding,heart attack,Breathing difficulties,severe pain heart stock.Hope you will get my point .Have a nice day ❣️
_Adnan
define infection ,prevention and control
Innocent
I think infection prevention and control is the avoidance of all things we do that gives out break of infections and promotion of health practices that promote life
Lubega
Heyy Lubega hussein where are u from?
_Adnan
en français
Adama
which site have a normal flora
ESTHER Reply
Many sites of the body have it Skin Nasal cavity Oral cavity Gastro intestinal tract
Safaa
skin
Asiina
skin,Oral,Nasal,GIt
Sadik
How can Commensal can Bacteria change into pathogen?
Sadik
How can Commensal Bacteria change into pathogen?
Sadik
all
Tesfaye
by fussion
Asiina
what are the advantages of normal Flora to the host
Micheal
what are the ways of control and prevention of nosocomial infection in the hospital
Micheal
what is inflammation
Shelly Reply
part of a tissue or an organ being wounded or bruised.
Wilfred
what term is used to name and classify microorganisms?
Micheal Reply
Binomial nomenclature
adeolu
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Source:  OpenStax, A comprehensive outline of world history. OpenStax CNX. Nov 30, 2009 Download for free at http://cnx.org/content/col10595/1.3
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