1 define the problem
2 establish criteria
3 consider alternatives
4 identify best alternative
5 develop a plan of action
6 evaluate
Answer:
From fertilization and to the end of the second week.
Explanation:
The development of the fetus is divided into three periods, established by most embryologists: pre-embyonic period, which goes from fertilization to the second week of development, embryonic period, which goes from the third week to the eighth week, and the fetal period, which goes from from the third month until the end of pregnancy.
The pre-embyonic stage begins at fertilization and remains until gastrulation. By the end of the second week the embryo already has the neural tube formed, although it is still open at both ends.
Answer:
D. Abdominal cavity
Explanation:
The abdominal cavity includes most organs from the digestive system, e.g. stomach, intestines, liver, appendix, rectum, and more. Thus, it's not apart of the central nervous system.
Have a lovely rest of your day/night, and good luck with your assignments! ♡
