They occur in germ cell DNA, which are the cells that create sperm or Ova. For every 85 million nucleotides assembled in DNA during human sperm or Ova production, One will be a mutation
Answer:
At about 38 weeks after conception, the fetal brain signals the release of hormones, specifically <u>oxytocin,</u> which prepares the fetus for delivery and begins labor.
Explanation:
Oxytocin is a hormone released by posterior pituitary gland because it is responsible for the uterine contractions during labour.
Fetal hypothalamus secretes corticotropin releasing hormone near term which stimulates fetal Anterior pituitary gland to secrete adrenocorticotropin hormone (ACTH) which stimulates adrenal cortex to produce cortisol which stimulates the secretion of estrogen from placenta, inhibition of P synthesis causing increased uterine contractions by cauisn increased oxytocin released from posterior pituitary gland.
Answer:
Explanation:
The Mesozoic Era is known as period of significant tectonicas well as climate, and evolutionary activity. It was known as as " Age of Dinosaurs or Reptiles" . During this era, the dominant form of life is dinosaurs.The Mesozoic Era come to life, arround 252.2 million years back. This Era can be sectioned into three different periods which are; ✓Triassic
✓Jurassic
✓Cretaceous
The span period of Cenozoic era was about 65 million years, this range from the end of the Cretaceous Period as well as the extinction of non-avian dinosaurs up to the present. Cenozoic era can be reffered to Age of Mammals such as (woolly rhinoceroses) this is because the largest land animals at this is mammals .The Cenozoic Era can be regarded as "new life" and it's known to be " age of mammals simply because largest animal that is available that time is mammals This era serves as the current as well most recent era among the three geological eras of the Phanerozoic Eon. The Cenozoic era has its spans of about 65 million years, and this range from towards end of the Cretaceous Period to the extinction of non-avian dinosaurs up to the present
The Cenozoic Era can be sectioned
into three periods which are;
✓ Paleogene : This is arround 66 million to 23 million years ago)
✓ Neogene : This is arround 23 million to 2.6 million years ago)
✓Quaternary; This is arround 2.6 million years ago to the present);
A mass extinction is when a certain group of animals or species suddenly die in large quantities with little to no hope of having a large birthrate to rebalance the losses.
This would have large effects on other parts of the food chain, and would lead to many species overpopulating and then drastically dying off
Hope this help
The first line of barrier that support the immune system by the invading microorganisms is formed by the skin and the mucous membrane.
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What is immune system?</h3>
A network of biological processes called the immune system guards an organism against disease.
<h3>How do skin and mucous membrane support the immune system?</h3>
The skin acts as the first line of defense and has specialized immune cells that help prevent the microorganisms from entering the body.
The mucous membrane which is more sensitive and lines up the internal organs of the body can sense and eliminate the microorganisms thus helping the immune system.
Learn more about the immune system with the help of the given link:
brainly.com/question/13257880
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