معلومات قصير موضوع انجليزي بحث تقرير بالانجليزي باللغة
الانجليزية انشاء
موضوع عن الحيوانات الاليفة وانواعها
اين تعيش ماذا ياكل مدة حياتها اسماء صغارها
تعبير عن الجمل بالانجليزي تعبير كتابي عن وصف حيوان
اليف عبارات قصيره للاطفال
information about
paragraph معنى
برزنتيشن معلومات بسيطه اسم
نطق كلمة معنى كلمة برجراف حيوان مفترس لاحم عاشب اليف متوحش وحيش الغابة
موسوعة عالم الحيوانات برمائي كل شيئ عن تزاوج انواع الانجليزي الشائعة معنى كلمة بالانجليزي اختصارات البيض
معلومات عن الحيوانات بالانجليزي موضوع عن الحيوانات
الاليفة بالانجليزي دورة حياتها
تغذية الحيوانات والحشرات على ماذا تتغذى كيف تتغذى
الموسوعة تتذوق الطعام تصنيف
فوائد الجنس للصف الرابع للصف السابع الاول الثاني
الثالث الخامس السادس الثامن التاسع كتابة
ذكر اضرار معلومات طائر انواع تربية قصة صفات حديقة الحيوانات مقدمة خاتمة
عرض المزرعة لرياض الأطفال براعم لائحة اسماء الحيوانات العاشبة اللاحمة حيوانات
تاكل النباتات مختلطة التغذية تتغذى الغريزة الحيوانية الكائنات
المخلوقات الحياة البرية الولودة
The oviparous, viviparous or ovoviviparous animal
develops differently before birth
The way animals develop before birth, defines
whether it is a viviparous, oviparous, or ovoviviparous animal. The mode of
reproduction is not a factor. In the case of birds that all lay eggs, and so
are all oviparous animals, it's pretty easy, but for snakes, that's another
thing.
By definition, an oviparous animal lays eggs, as
birds do, but without necessarily nesting and hatching. So, turtles, many
reptiles and snakes are oviparous animals, even if they do not brood.
So insects, invertebrates, crustaceans, the
majority of fish ... who also lay eggs without necessarily nesting or brooding,
are also oviparous animals.
The egg contains the embryo of the animal, and it
must continue to evolve outside the body of the female. It also contains
'food', the yellow, which is used to feed nutrients for the developing embryo.
The female is no longer the source of nutrition of the small.
Once it is sufficiently developed, it is hatching,
and the small breaks the shell of the egg to get out.
The viviparous animal gives him a little completely
formed, and not yet in the embryonic state. Gestation is often longer,
especially in large animals, and the small is fed by an umbilical cord. Once
the little one is fully developed, it comes into the world, and depending on
the kind of animal, the parents can take care of it, or just let it fend for
itself.
In the case of mammals, which are viviparous
animals, the mother is usually the one who takes care of feeding and protecting
the young, until they are adults. The marsupials are an exception, because the
little one is not very formed when it goes up in the ventral pocket to continue
its development.
The ovoviviparous animals themselves, are a little
a mixture of both modes, the time of development of the embryo. After mating,
the female produces eggs, but she does not pit them, or, as for the
hippocampus, she transfers them to the male who wears them in a ventral pocket.
The development of embryos is like the egg of a bird. Nutrition is not produced
by the mother, or the male, being contained in the egg.
When birth comes, hatching is done in the mother's
womb, and the little developed ones come out as for a viviparous birth. Some
snakes, reptiles and fish give birth to completely formed cubs instead of
laying eggs.
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