Question

Place these developmental milestones in the correct order. (1 being the first milestone to happen) baby is born different cell layers form cell divides heartbeat/movements detected movements strengthened organ systems mature organs and limbs form embryo implants size and weight increase greatly sperm fertilizes egg

Answer 1

Answer:

The correct order in which development occurs from fertilization of the egg is:

1. Sperm fertilizes egg .
2. Cell divides.
3. Implants size and weight increase greatly.
4. Different cell layers form .
5. Organs and limbs form embryo.
6. Heartbeat/movements detected .
7. Movements strengthened .
8. Organ systems mature .
9. Baby is born.

Explanation:

1. Sperm fertilizes egg: it is the process called fertilization, which consists of the union of the paternal gametes to originate the zygote.
2. Cell divides: Once the zygote has formed, it undergoes successive divisions by mitosis, to originate the different structures.
3. Implants size and weight increase greatly: successive divisions cause the implanted zygote to progressively increase in size.
4. Different cell layers form: consists of the formation of the embryonic layers -ectoderm, mesoderm and endoderm- from which the tissues and organs of the embryo will be formed.
5. Organs and limbs form embryo: from the three embryonic leaves the different apparatuses and sisythems of the embryo are formed.
6. Heartbeat / movements detected: Initiates the function of organs such as the heart and extremities.
7. Movements strengthened: movements in the embryo are more continuous and defined.
8. Organ systems mature: the nervous, cardiovascular, digestive and respiratory systems, among others, are suitable for birth.
9. Baby is born.

When the baby is able to survive outside the womb, birth occurs.

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