The first invertebrates to show both segmentation and a complete digestive system belong to the

1 answer:

4 0

The first invertebrates to show both segmentation and a complete digestive system belong to the phylum Annelida that includes earthworms, leech, sandworms, etc.

These segmented worms have complete digestive system which is also known as tube-within a tube. These can be found in freshwater, marine water or can even be terrestrial.

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

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Explanation:

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

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

Learn more:

Development of the offspring brainly.com/question/465851

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