Secretion of human chorionic gonadotropin [HCG] only occur during pregnancy in the placenta. The concentration of this hormone increase rapidly during the first three months of pregnancy; the amount in the blood stream doubles every two to three days as the development of the placenta and embryo progress. The hormone reaches its maximum concentration peak around the sixth week of pregnancy and after this, its concentration decline.
Explanation:
On your own notebook paper write a four sentence summary of the most important ideas on each section
what is Environmental science
How do we study Environmental science
Step 1: Isolate the two kinds of DNA.
Step 2: Treat the plasmid and foreign DNA with the same restriction enzyme.
Step 3: Mix the foreign DNA with chopped plasmids.
Step 4: Add DNA ligase.
The answer is A. Fallopian Tube. The ovaries create the egg and the fallopian tubes hold the zygote until it is fertilized, then transfer it to the uterus.
The word biology comes from the Greek word <em>bios</em>, meaning life, and <em>logos</em>, meaning study.
