Of all the ancient calendar systems, the Maya and other Mesoamerican systems are the most complex and intricate. They used 20-day months, and had two calendar years: the 260-day Sacred Round, or tzolkin, and the 365-day Vague Year, or haab. These two calendars coincided every 52 years.
The one that could affect human population would be :
A. Deadly virus emerges that can pass from human to human.
This will greatly decrease the amount of human population
C. Nuclear war breaks out between two nations
This will kill a lot of people and also potentially creating genetic mutations for the next generation
D. Immigration to united states from china increases
This will make it harder for the population to get the resources that they need for their living
hope this helps
Carol is distressed because post-childbirth complications prevented her from being in close physical contact with her child during his first few hours of life. Carol should be told that... human infants do not have well-defined critical periods for the formation of a mother-infant attachment.
What is the most common complication of childbirth?
Postpartum depression is the most common complication of childbirth. Up to 50% to 60% of all new mothers experience postpartum blues during the first 2 postpartum weeks.
Childbirth complications:
include eclampsia, cardiomyopathy, sepsis, embolism, transfusions, heart attack, respiratory distress, shock, and anesthesia complications occurred within a certain window surrounding delivery
What are the three complications of childbirth?
3 of the most dangerous pregnancy and/or delivery complications are: (1) uterus rupture; (2) shoulder dystocia, and (3) umbilical cord prolapse.
Learn more about childbirth complications:
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