<span>Human chorionic gonadotropin hormone (hCG)
This hormone is produced by a woman only during pregnancy and is responsible for "pregnancy symptoms," such as vomiting and nausea.
It is primarily produced by the placenta shortly after the dividing fertilized egg cell (embryo) attaches or implants itself into the uterine lining (endometrium). This occurs a few days after the woman has conceived.
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the molecule has no nitrogen atoms
Answer:
Plants take up essential elements from the soil through their roots and from the air (mainly consisting of nitrogen and oxygen) through their leaves. Nutrient uptake in the soil is achieved by cation exchange, wherein root hairs pump hydrogen ions (H+) into the soil through proton pumps.
Answer:
At each higher level of consumption, the amount of toxin is magnified.
Explanation:
Those predators all eat smaller secondary consumers, and those secondary consumers eat the primary consumers, which a lot of the times are exposed to DDT. For example bugs are often the primary target for DDT, once those bugs are exposed to the DDT they carry it in/with them. When a fish eats the bug, that fish is now exposed to the DDT. When the fish is caught and eaten by an eagle that eagle and its young are now being exposed to DDT. The DDT might not effect the full grown eagle for its lifetime but it does effect its young.
Answer:
a system formed by the interaction of a community of organisms with their physical environment.