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.
<span>jthe first thing alcohol impairs is your udgment</span>
<span>Hello, thank you for your question.
The answer to the question, "</span><span>Which of the following results from stimulation by the sympathetic nervous system?," would be:
</span><span>
A) release of glucose from the liver</span>
Answer: The digestive tract starts by chewing and swallowing food. From there the food travels down the esophagus easily because it goes with a liquid Siliva enzyme. After, the food goes into the stomach where it is processed into a thick liquid called chyme. It then travels to the lower part of the stomach known as the atrium where it is ready to be released into the small intestine. The small intestine, or small bowel, is a hollow tube about 20 feet long that runs from the stomach to the beginning of the large intestine. The small intestine breaks down food from the stomach and absorbs much of the nutrients from the food. The food then travels to the large intestine where salts and sugars that could not be digested are absorbed. The rectum stores the stool, then the anus pushes it out in a bowl movement.
Explanation:
I wrote it all myself.
The main organ of the respiratory system is the lungs.
