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Ovotesticular syndrome (also known as ovotesticular disorder or OT-DSD) is a rare congenital condition where an individual is born with both ovarian and testicular tissue. [1] [2] It is one of the rarest disorders of sex development (DSDs), with only 500 reported cases. [3]
Our early human ancestors had a much greater adaptability to survive in extreme environments than previously thought Early humans adapted to harsh conditions over a million years ago, researchers find
The obstetrical dilemma is a hypothesis to explain why humans often require assistance from other humans during childbirth to avoid complications, whereas most non-human primates give birth unassisted with relatively little difficulty. This occurs due to the tight fit of the fetal head to the maternal birth canal, which is additionally ...
Humans inhabit hot climates, both dry and humid, and have done so for millions of years. Selective use of clothing and technological inventions such as air conditioning allows humans to live in hot climates. One example is the Chaamba, who live in the Sahara Desert. They wear clothing that traps air in between skin and the clothes, preventing ...
“I actually did some calculations years ago and found that if we could cure human aging, average human life span would be more than 1,000 years,” he tells Scientific American. “Maximum life ...
In humans, the embryo is referred to as a fetus in the later stages of prenatal development. The transition from embryo to fetus is arbitrarily defined as occurring 8 weeks after fertilization. In comparison to the embryo, the fetus has more recognizable external features and a set of progressively developing internal organs.
The law did not include exemptions for congenital anomalies, including conditions that will cause a newborn to die soon after birth. The new study compared infant death rates in Texas from 2018 to ...
Embryonic diapause [a] (delayed implantation in mammals) is a reproductive strategy used by a number of animal species across different biological classes.In more than 130 types of mammals where this takes place, the process occurs at the blastocyst stage of embryonic development, [1] and is characterized by a dramatic reduction or complete cessation of mitotic activity, arresting most often ...