What are the clusters of nerve cells in roundworms called?

Were you able to observe the nucleolus in any of the cells if so which ones

Which of the following is a period in the paleozoic era? devonian cambrian permian all of the above

Prior knowledge can be gained from personal experience and a) forming well-developed hypotheses. b) listening to opinions of other people on a topic. c) researching previous experiments and results on a topic. eliminate d) no other methods. it can only be gained by personal experience.