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Developmental Patterns - Metazoa
The metazoans or Animalia can be divided into two groups on the basis of body symmetry. The bilateral metazoans can be divided into two great assemblages: the Protostomia and the Deuterostomia.
Platyhelminthes, Molluscs, Annelida, Arthropods and a number of minor phyla are classified as Protostomes while Echinodennata, Chordata and at least two minor phyla are included in the deuterostomes. The features used to place animals in these groups are largely developmental.
In almost all animal groups, the mode of speciation is geographic speciation. It is essential that a population which is a prospective new species is geographically isolated from t
Organization in non-reduced embryo sacs The fate of a nucleus in the embryo sac depends upon its position. Many irregularities in the disposition of nuclei in the early polar
how do birds respire while flying??
Once the decision to start drug treatment of hypertension is made, the aim should be to provide 24 hour BP control, with agents that would encourage patient adherence. The patient
Soil – plant – animal relationship The plants derive the minerals from soil, and the animals from the plants / feed they consume and there is a dependent interrelationship bet
Sickling occurs in deoxyhemoglobin, but not in oxyhemoglobin. Normal deoxyhemoglobin (HbA and HbS) molecules have a small hydrophobic "pocket" on the surface of a ? chain. In oxyhe
Epilimnion - Summer Stratification This forms the upper layer of the lake and consists of freely- circulating warm water which is well lighted though poor in nutrients. Most o
Define Physiological effects on the GIT of prebiotics? Since prebiotics are fermented by the gut microflora, they may have physiological effects on the GIT such as: Cont
Developmental Concepts Unique to Infants and Young Children The cognitive and social emotional development of infants and very young children has unique features. This age rang
Louping ill This is an infectious encephalomyelitis of sheep and man occurring during spring and summer when the vectors like ticks are active. It is reported from British Isl
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