In humans, the placenta is essential to the embryo for RESPIRATION, NUTRITION AND EXCRETION.
The placenta refers to an organ in the uterus of pregnant mammals that is responsible for nourishing and maintaining the unborn baby through the umbilical cord. Th placenta has many functions but primarily it plays critical roles in the nutrition, respiration and excretion of the fetus. Its other functions include: production of hormones, production of immunity for the fetus for prevention from infections, etc. <span />
I think they are all biotic factors..hmm if not take out whichever sounds the most not fitting.
They are joined together by a common centromere.
Answer:
C
Explanation:
0.20-0.10=0.10
because the population was decreased