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
#SPJ4
<span>(B) is the most correct answer. Social Security becomes the main way a person earns income after they reach the age of at least 62. This way, a person who has retired from the workforce can still draw an income and be able to live comfortably without having to worry about having a retirement plan in place.</span>
Answer:
Details of Louisiana Purchase: United States purchase 827,000 square miles of land west of the Mississippi River which previously belonged to the French Empire for $15 million.
At that time, Jefferson's had two main concerns about the deal :
- The region surrounding the purchased territory was shared between Spain and Great Britain. He's worried that a potential conflict might occurred with them because of the purchase
- The constitution did not directly stated that the president has the power to purchase the territory belonged to another countries.
Answer:
C
Explanation:
it isn't in the north or middle then west or east is a judgement call.
the answer is B surface zone
