Indigenous<span> cultures shaped, and were shaped by, the </span>geography<span> of North America. The first North Americans are believed to have </span>migrate<span>d from Siberia, in northeast Asia, by crossing a </span>land bridge<span> over the Bering Strait. These populations fanned out southward, to present-day Florida, California, Mexico, and Central America. </span>
<span>The Olmec and the Maya, indigenous to Central America, built the first cities on the continent, eventually leading to the great urban areas of Tenochtitlan, Texcoco, and Tlacopan. These cities, in what is now central Mexico, boasted </span>sophisticated engineering<span> structures, such as </span>canal<span>s, apartment buildings, and </span>irrigation<span> systems. </span>
<span>Many of these early North American cultures were scientifically and agriculturally advanced. Mayan calendars and </span>almanac<span>s recorded </span>celestial<span>events such as </span>eclipse<span>s and </span>seasonal<span> changes. The Mayans were also mathematically advanced. Their counting system was able to represent very large numbers using only three symbols: dots, lines, and a football-shaped symbol that indicated a zero. The Mayans were, in fact, the first culture to have a written symbol for zero. </span>
<span>Cultures throughout southern North America harvested corn, squash, and beans in regular cycles. This sort of </span>agriculture<span> allowed major </span>civilization<span>s to develop. People were no longer bound to produce food and shelter for their families—some people could work in the food and construction industries while others became engineers, artists, and political leaders. Leading North American civilizations include the Maya and Aztec, in what is now Mexico, and the Iroquois, native to southeastern Canada and the northeastern United States. .................</span>
The physical manifestation of this condition exists breathing difficulty after activity or exertion. A depressed sternum would be regarded funnel chest or pectus excavatum. S-shaped spinal curvature would be regarded as scoliosis.
<h3>What are the symptoms of pectus carinatum?</h3>
- breathing difficulty after activity or exertion.
- chest pain
- spine's lateral curvature.
- lack of the upper back's curvature.
- shoulders with hooks.
- a wide, slim chest.
When the chest extends beyond the sternum, pectus carinatum is present. It is frequently claimed that it makes the person look like a bird.
The ribs slant backward, and the sternum protrudes. This congenital deformity, often known as pigeon chest, is characterized by an abnormal protrusion of the sternum and a rearward slope of the ribs.
A depressed sternum would be regarded funnel chest or pectus excavatum. S-shaped spinal curvature would be regarded as scoliosis.
As the anteroposterior diameter rises to match the transverse diameter, a rounded chest would be referred to as a barrel chest.
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Answer:
Civilizations expand through trade, conflict, and exploration. Usually, all three elements must be present for a civilization to grow and remain stable for a long period of time.
Explanation:
I didn't find an exact answer, but i think this helps
Answer:
between 62 and 98.
Explanation:
This question can be solved faily easy:
We denote "B" as the value average of the four test values for B score (between 80 - 89) and "X" as the score on the 4th test so to find the range of values that Alice needs to score in the 4th test we only have to replace in the next formula:
We reformulate the equation in function of B
We have the next range of values for "B" (80, 81, 82, 83, 84, 85, 86, 87, 88, 89), we replace those values in the formula and operate to get the range of values we need to score in the 4th test.
As we can see for Alice to get a B for the semester she needs to score on the 4th test a score between 62 and 98 points.
