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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B. They were slave states that stayed in the Union.
The border states were slave states that stayed in the Union and were a great advantage to the Union by giving them an advantage in terms of troops and money.
Answer:it affect the community positively because the more learned people are in the community the better the community becomes .
Learned people are able to attract positivity to the community through them being able to go to the right places to request certain basic needs of the community .
They can also be able to encourage the community member to have the voice and not fear to voice out their needs
For new england colonies their activites are fishing, lumber and whaling
for middle colonies they depended on agriculture (mostly the production of wheat) shipping and trade
southern colonies trade and agriculture ( mostly tobacco and cotton)
