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A species of trilobite was found in the fossil record. At its first appearance, it is similar to an ancestor species but differs from the ancestor in several key characteristics. It seems to change little over several million years, then is extinct. This illustrates the concept ofA species of trilobite was found in the fossil record. At its first appearance, it is similar to an ancestor species but differs from the ancestor in several key characteristics. It seems to change little over several million years, then is extinct. This illustrates the concept of punctuated equilibrium. gradualism. developmental evolution. anagenesis. evo-devo.
Theor y of Epigenesis (i) It was proposed by C.F. Wolff & supported by Von Baer. (ii) Wolff proposed that germ cells contain definite but undifferentiated
Q. Why is the uricotelic excretion essential for reptile and avian embryos? In birds and reptiles the excretory system is uricotelic since uric acid is less toxic, insoluble an
Explain about functions of the lacrimal apparatus. Tear Secretion Aqueous tears are secreted by the main (reflex secretion) and accessory (basic secretion) lacrimal
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Phylum platyhelminthes (13,000 species Flatworm) The body is flattened. Gastrovascular cavity is branched, dense bodies with many cell layers, mouth but no anus. Hermaphrodite
Q. Are the limbs modified into wings of bats and the wings of birds instance of evolutionary homology or analogy? What about whale fins compared to fish fins? Bird and Bat wing
State the Variety of chemical and biological reactions Variety of chemical and biological reactions takes place leading to the formation of the solution phase. If we analyse th
Oxygenator : They serve the function of lungs during extra corporeal circulation (ECC) - Oxygenation, removal of carbon dioxide and transport of gaseous anaesthetic agents:*The o
Define the genetic growth pattern of infant? It takes 1-3 years for an infant to establish his own genetic growth pattern. Once this figure is established (such as height-for-a
a) In humans, is it the sperm or the ovum which verifies the sex of the offspring? b) Give a reason for your answer. (a) The sperm verifies the sex of the off
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