Neurogenesis
As recently as two decades ago, scientists believed we were born with all the neurons we would ever have. But the discovery of neurogenesis occurring in certain brain areas in monkeys gave rise to the hope that someday scientists will be able to induce the adult human brain to heal itself.
Neurogenesis is the process by which new neurons are created and developed in the brain. The new neurons are created by neural stem cells and it happens in almost all species of animals. Neurogenesis is effectual during embryonic development and completely through adult life in different organisms.
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<span>D) a structure made of two or more tissues functioning together for a common purpose.
This is because of the different levels of life. Cell, then tissues, then organs.</span>
B. Storage body fat helps increase the effects of aging.
Explanation:
Fats are organic compounds that are insoluble in water and tend to solidify at room temperature.
Fats are essentially produced in animal body.
These are one of three macro-nutrients required in the body.
Adipose tissue which are also known as padding tissue function as a store house of fat.
They serve as cushion and protect the internal organs from shock or injury.
Fats are storehouse of energy and provide much more energy than the carbohydrates could.
They insulate the body and prevent the loss of heat in cold weathers.
Answer:
The reason why only 3 out of the 22 possible autosomal trisomies are seen in newborns, is because the rest of them are chromosomal abnormalities not compatible with life and thus an spontaneous abortion occurs. The embryos suffering from these trisomies do not survive for more than a few weeks in the uterus, so the miscarriage often goes unnoticed for the mother as she may not have realized she was pregnant.
The only trisomies that are allow fetuses to be born are: Patau Syndrome (trisomy 13), Edwards Syndrome (trisomy 18), and Down Syndrome (trisomy 21). Out of these three, people with Down Syndrome have the largest life expectancy.