What is the stucture called in agnathans, which will become the endoskeleton in more evolutionary anvanced organism??? please2× i need help

Aman wearing warm clothes in a cold place would be an example of how humans adapt to their environment. affect their environment. can change their environment. choose where to live.

Did the spanish settlers and missions have a positive effect on world history? why, what did they do that was positive? why was the treaty of paris (1763) good for the world/world history? did the plymouth colony have a positive effect on world history? why, what did they do that was positive?

What are contributions made by francis bacon