Answer ONE of the four following essay questions. a- List th…

Answer ONE of the four following essay questions. a- List the FOUR types of regeneration (2 points). Identify a main characteristic for each of the four types (3 points). b- Explain the main differences between primary and secondary neurulation. c- Define the concept of system biology for developmental biology (2 points). Describe its importance to the field (3 points). d- Explain the differences between a paracrine, autocrine, endocrine and juxtacrine factor (5 points).