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Flourishing along the hot Gulf Coast of Mexico from about 1200 to about 400 BCE, the Olmec produced a number of major works of art, architecture, pottery, and sculpture. Most recognizable are their giant head sculptures ( [link] ) and the pyramid in La Venta. The Olmec built aqueducts to transport water into their cities and irrigate their fields. They grew maize, squash, beans, and tomatoes. They also bred small domesticated dogs which, along with fish, provided their protein. Although no one knows what happened to the Olmec after about 400 BCE, in part because the jungle reclaimed many of their cities, their culture was the base upon which the Maya and the Aztec built. It was the Olmec who worshipped a rain god, a maize god, and the feathered serpent so important in the future pantheons of the Aztecs (who called him Quetzalcoatl) and the Maya (to whom he was Kukulkan). The Olmec also developed a system of trade throughout Mesoamerica, giving rise to an elite class.

A photograph shows a massive carved stone head with a flat nose, large lips, and slightly crossed eyes.
The Olmec carved heads from giant boulders that ranged from four to eleven feet in height and could weigh up to fifty tons. All these figures have flat noses, slightly crossed eyes, and large lips. These physical features can be seen today in some of the peoples indigenous to the area.

The maya

After the decline of the Olmec, a city rose in the fertile central highlands of Mesoamerica. One of the largest population centers in pre-Columbian America and home to more than 100,000 people at its height in about 500 CE, Teotihuacan was located about thirty miles northeast of modern Mexico City. The ethnicity of this settlement’s inhabitants is debated; some scholars believe it was a multiethnic city. Large-scale agriculture and the resultant abundance of food allowed time for people to develop special trades and skills other than farming. Builders constructed over twenty-two hundred apartment compounds for multiple families, as well as more than a hundred temples. Among these were the Pyramid of the Sun (which is two hundred feet high) and the Pyramid of the Moon (one hundred and fifty feet high). Near the Temple of the Feathered Serpent, graves have been uncovered that suggest humans were sacrificed for religious purposes. The city was also the center for trade, which extended to settlements on Mesoamerica’s Gulf Coast.

The Maya were one Mesoamerican culture that had strong ties to Teotihuacan. The Maya’s architectural and mathematical contributions were significant. Flourishing from roughly 2000 BCE to 900 CE in what is now Mexico, Belize, Honduras, and Guatemala, the Maya perfected the calendar and written language the Olmec had begun. They devised a written mathematical system to record crop yields and the size of the population, and to assist in trade. Surrounded by farms relying on primitive agriculture, they built the city-states of Copan, Tikal, and Chichen Itza along their major trade routes, as well as temples, statues of gods, pyramids, and astronomical observatories ( [link] ). However, because of poor soil and a drought that lasted nearly two centuries, their civilization declined by about 900 CE and they abandoned their large population centers.

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, U.s. history. OpenStax CNX. Jan 12, 2015 Download for free at http://legacy.cnx.org/content/col11740/1.3
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