This may be wrong, but I believe that it comes with the embryo it's self and provides nutrients.
During development, an embryo is embedded in the the endometrium during the first week of pregnancy. The endometrium is the innermost muccous membrage of the uterus. The embryo becomes implanted in it, then the surrounding tissue forms sinuses that exchange nutrients and later becomes the placenta.
The structure that surrounds the yolk and transports nutrients to the embryo is called the vitelline membrane. This membrane is responsible for facilitating the exchange of nutrients and waste products between the yolk and the developing embryo during embryonic development.
In mammals, the site of embryo development is the uterus.
The embryo is obtains nutrients by drawing them from the mother's blood. Thus, whatever the mother takes in that alters chemical composition of her blood can potentially affect the embryo.
The endosperm in monocots serves as a storage tissue for nutrients such as starch, proteins, and lipids, which are used by the developing embryo during seed germination. It provides essential nutrients for the growth and development of the embryo until it can establish its own photosynthetic capabilities.
The growing embryo gets energy from nutrients supplied by the mother through the placenta. These nutrients, such as glucose and amino acids, are essential for the embryo's development and growth.
During the late stages of development, an embryo undergoes rapid growth and further organ formation. At this stage, the major organ systems are well formed, and the embryo is starting to resemble a human fetus. Specialization of tissues and organs continues as the embryo prepares for further growth and development.
Antipodal cells in plants provide support for the embryo sac and have a role in the development of the endosperm. They are also involved in the release of nutrients to support embryo development.
When the yolk is where the embryo develops, it is called telolecithal development. In this type of development, the yolk is concentrated at one pole of the egg, providing nutrients for the developing embryo. Examples of organisms that exhibit telolecithal development include birds and reptiles.
Yes it does.
The exchange of substances between the mother and embryo takes place in the placenta. The placenta is a temporary organ that develops during pregnancy to provide nutrients and oxygen to the embryo and remove waste products. This exchange is crucial for the growth and development of the embryo.
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