Answer:humans have 46 chromosomes (male and female)
Explanation:
The correct answer is: Endoderm
en·do·derm
the innermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the lining of the gut and associated structures.
blas·tu·la
an animal embryo at the early stage of development when it is a hollow ball of cells.
mes·o·derm
the middle layer of an embryo in early development, between the endoderm and ectoderm.
ec·to·derm
the outermost layer of cells or tissue of an embryo in early development, or the parts derived from this, which include the epidermis and nerve tissue.
Hope this helped you! :3
About 60% of natural conceptions fail to implant properly. One of the reasons may be the failure of the embryo to generate Trypsin, a chemical which induces a receptive environment in the uterus in order for the fetus to be implanted. The excess or lack of chromosomes of the fertilized egg may also be a factor in implantation failure. A weak immune system of the woman may also be an important factor.
High oxygen in the water and low oxygen in the blood
