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.
Science and technology is co-related with health, population and environment. They are the significant means of development process. It's making the human life more comfortable and productive invention of various technology has made the treatment of health easy and reliable.
Answer:
Rescheduling Thanksgiving dinner because of work.
Answer:
B
Explanation:
A peptide is a short chain of amino acids. ... Meanwhile, proteins are long molecules made up of multiple peptide subunits, and are also known as polypeptides. Proteins can be digested by enzymes (other proteins) into short peptide fragments. Among cells, peptides can perform biological functions.
