I think its 20, we briefly covered this in class
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The answer is stratosphere...
Answer:
Ribosome.
Explanation:
Cystic fibrosis is a disease inherited, this means, the disease is a mutation in a chromosome (a gene whose code has been altered). DNA information is transformed into proteins at ribosomes (the organelle in charge of protein synthesis) but the error comes from the DNA.
Answer:
D. Transport of oxygen through a placenta to a fetus.
Explanation:
Zygotes are fertilized egg cell, zygotes aren't produced in the ovaries but ovums or egg cells are produced in the ovaries. So option A is false.
Fertilization is internal not external in human. Option B is wrong.
Production of milk happens in the mammary gland (the breast) not in the reproductive system. Option C is false.
Transport of oxygen through a placenta to a fetus. The placenta is a vascular organ which is implanted in the wall of the uterus (a part of the female reproductive system) and links to the foetus through the umbilical cord.