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Posted by Kartik Gupta 7 years, 11 months ago
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Amar Kumar 7 years, 11 months ago
Earthworm has various openings and structures on ventral surface. Single median opening per segment is present towards the dorsal surface through which coelomic fluid oozes out.
Ventral side of earthworm could be identified by presence of locomotory structures, called setae . These are microscopic, present in rows.
Then there are paired openings of seminal receptacles , and male genital pores . Male genital pores are often associated with genital papillae on adjacent segments. Earthworm is hermaphroditic, so paired female genital pores are also present towards ventral side.
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Amar Kumar 8 years ago
An ecosystem is a community of plants, animals and smaller organisms that live, feed, reproduce and interact in the same area or environment.These biotic and abiotic components are regarded as linked together through nutrient cycles and energy flows.
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Amar Kumar 8 years ago
Polyembryony is the formation of more than one embryo from a single fertilized ovum or in a single seed.
Polyembryony is the phenomenon of two or more embryos developing from a single fertilized egg.Polyembryony can occur in humans, resulting in identical twins, though the process is random and at a low frequency. Polyembryony occurs regularly in many species of vertebrates, invertebrates, and plants.
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Kritika Trehan 8 years ago
Prenatal development is the process in which an embryo and later fetus develops during gestation. Prenatal development starts with fertilization the first stage in embryogenesis which continues in fetal development until birth
Posted by Vishal Kashyap 8 years ago
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Anshika Pandey 7 years, 11 months ago
1Thank You