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Because a circulation is required early - as soon as diffusion no longer can carry materials throughout the body of the fetus.

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9y ago

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What is an organism at an early stage of development?

embryo


What is gastsrulation?

Gastrulation is a phase early in the development of most animal embryos, during which the morphology of the embryo is reorganized to form the three germ layers: ectoderm, mesoderm, and endoderm.


How many zygotes are used to form identical twins?

Identical twins develop from a single zygote that splits into two embryos during early development. Therefore, only one zygote is needed to form identical twins.


When the cell mass is fully implanted in the uterus it is called a?

When the cell mass is fully implanted in the uterus, it is called a blastocyst. This is an early stage of development in mammalian embryos, just before the embryo begins to form distinct structures.


How are embryos made?

Embryos are created through the process of fertilization, which involves the fusion of a sperm cell with an egg cell. Following fertilization, the resulting zygote undergoes cell division to form an embryo. This early developmental stage eventually grows into a fetus and then a fully formed organism.


How do embryos grow?

Embryos grow through a process called embryogenesis, where cells divide, differentiate, and organize into various tissues and organs. This process is guided by genetic information and signaling molecules that direct cell fate and development. As the embryo grows, specialized structures form, ultimately leading to the development of a fully formed organism.


In way are all developing embryos similar?

All developing embryos go through a series of stages, from fertilization to differentiation and organ formation. They also possess a similar genetic code, containing the instructions necessary for development. Additionally, all embryos start as a single cell and undergo cell division to form a multicellular organism.


Organum was an early form of what major musical development?

Polyphony


Organum was an early form of what major musical event development?

polyphony


Are sperm and eggs both embryos?

No, sperm and egg unite to form a zygote, a single fertilized cell. That cell divides again and again, forming a blastocyst. The blastocyst implants in the uterine wall (in placental mammals), where the embryo at last develops. Eventually the embryo grows into a fetus, and the fetus undergoes parturition (it is born).


Is embryo a gamete?

No, an embryo is not a gamete. A gamete is a specialized reproductive cell (sperm or egg) that fuses with another gamete during fertilization to form a zygote, which then develops into an embryo. An embryo is the early stage of development after fertilization.


At what point in development does the nervous system begin to form?

The nervous system begins to form in the early stages of embryonic development, around the third week after conception.