The beginning of the Cambrian Period is marked by the evolution of hard body parts such as calcium carbonate shells. ... These body parts fossilize more easily than soft tissues, and thus the fossil record becomes much more complete after their appearance.
Hello!
I am sorry to break to you, but no one can answer this! Maybe organizing the question better?
First Blank Space:Flourens
Second Blank Space:Broca
Answer:
The three parts of an amino acid are the carboxyl group, the amino group, and the central carbon that contains the R group.
They feed by filtering feeding they feed on tiny organic material which is filtered through them
