What is chorion??? What's it's function?

The chorion is one of the first membranes that forms during a pregnancy and is composed of two layers, the mesoderm and trophoblasts. ... The chorion is crucial to the fetus, since it provides life support by providing for a pathway for the exchange of gases, blood, and waste between the mother and the fetus.

The functions of the chorion are to protect and nurture the embryo. The chorionic fluid protects the embryo from shock, and the chorionic villi allow the exchange of nutrients, oxygen and waste products with the mother.

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an organism's phenotype is the  form of a trait  that it  displays. for  flowercolor, a pea  plant  can  display  a phenotype of purple or white flowers. an organism's  genotype  is the alleles of a gene it contains. based on his data, mendel concluded that a phenotype can be  determined  by more than one  genotype.

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]