in the course of fish evolution, two of the gill slits slowly advanced into the jaws.
The evolution of fish started about 530 million years in the past at some point during the Cambrian explosion. It become during this time that the early chordates advanced the cranium and the vertebral column, main to the first craniates and vertebrates. the first fish lineages belong to the Agnatha or jawless fish.
The earliest fish, corresponding to living hagfish, developed about 550 million years in the past. Diversifications that in the end advanced in fish include an entire vertebral column, jaws, and an endoskeleton manufactured from bones in preference to cartilage. Fish live in the course of the sea and in freshwater lakes and streams.
New studies have uncovered the genetic foundation of gill covers in fish, which came about over 430 million years ago. It sheds light on one of the most essential evolutionary traits for fish, in addition to over vertebrates.
In jawless fishes, a sequence of gills opened behind the mouth, and those gills became supported by way of cartilaginous elements. the primary set of these elements surrounded the mouth to shape the jaw.
Learn more about the evolutions of fishes here: brainly.com/question/1426050
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<span>His mental
age is 6. Mental age is a concept that refers to the level of
intelligence of the person compared to the average intellectual
performance in an age group. <span>The scores are considered
average when the score is between 90 and 110, if they exceed this value
it is considered that the person has an intelligence superior to their
age group, so their mental age is greater than their biological age.
I hope my answer can help you.
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The correct answer to this open question is the following.
As your question is so general with no specific reference, we can comment on the following.
According to the organization "Love Is Respect, one of ten students of high school has been hit or slapped by its couple. One in three H.S. students has been a victim of some kind of abuse from its partner. The abuse could have been emotional, verbal, physical, or sexual. And the consequences of these types of aggression last for many years.
Another terrible number is that in one year, approximately 1.5 million of H.S. students have incidents related to physical violence from its romantic partners.
These types of violence start when girls are 12 to 18 years old. And from 16 to 24 years, girls experience the most violent conduct from their partners. And all of this has to change because women deserve the utmost respect.
