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.
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The other three are already well established.
The cell as a system contains the organelles sites of most cells active. Assembly line where workers do Endoplasmic Reticulum
Answer:
yes it is yes it is abiotic factor