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Express the term in brief - Protonephridia.
An osmoregulatory-excretory structure found in some invertebrates. Also known as a flamecell, this tubule is closed at its distal end. The beating of internal cilia pull water across the cell membrane and then propels it down the tubule.
Q. What is the typical feature of the epithelia? How different is it from the connective tissue? The typical feature of the epithelium is the almost absence or absence of space
The Eukaryotic transcription is more difficult than prokaryotic transcription. For example, in eukaryotes the genetic material DNA and therefore transcription is basically localize
Spiral Cleavage - Metazoa In Spiral Cleavage, however, the third and fourth cleavage planes are oblique to the polar axis and the resulting blastomeres do not lie on top of on
Controlling Introduction of Alien Species As you know the alien species can cause the existing population to decrease or even become extinct. The individuals of alien species
Tail - Structure of the Sperm The tail or flagellum is the longest part of the sperm. By its movement it causes the sperm to swim with the head forward. It consists of a thin
Why are the tropical forests also known as stratified forests? In the tropical forests tall trees of several species have their crowns forming a superior layer under which dive
what is excretory product of lion
Is there a exchange of cells between the mother and the fetus through the placenta? Under normal conditions, there is not a passage of cells across the placenta during gestati
Endosperm with micropylar Haustorium A very prominent and aggressive micropylar haustorium is seen in Impatiens. Here the division of the primary endosperm nucleus is followed
what are the advanced characters of phylum annelida that cannot be found in other phyla?
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