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.
The following that spreads disease is when you dry your hands with a
shared cloth towel. The answer is letter B. Once you clean your hands with a
towel, you are leaving some excess dirt behind.
Answer:
A chronic disease is a disease that comes and becomes more stronger overtime like cancer and it takes time to take effect and become more severse
