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Q. Is fecundation in amphibians internal or external? In this aspect are amphibians evolutionarily proximal to fishes or to reptiles?
In the majority of the amphibian species fecundation is external. This feature is common to bony fishes too and the embryonic development of amphibians are a heritage from osteichthyes and it shows that the reproductive system.
Curiously although having external fecundation amphibian female and male copulate to stimulate the liberation of egg cells and sperm. This phenomenon does not characterize internal fecundation since the gametes unite in water.
Distinguish between epithelial and connective tissues with respect to their cell arrangement? PROVIDE a specific example( for both tissue types) of how the arrangement of cells hel
What are the stomata? How these structures participate in the plant transpiration? The Stomata (singular, stoma) are small specialized passages for gases and water present in t
Q. Non-Modifiable Risk Factors for coronaru heart diseases? Non-Modifiable Risk Factors 1. Age 2. Sex 3. Heredity 4. Endomorphic Body Build Family history: Pe
What are the events that mark the beginning and the end of the third interphase period? What happens in the cell in this period? The third interphase period is the G2. It star
Nutrient Cycling in Tropical and Temperate Forests From this study of the nutrient cycles you must have realised the importance of the role of green plants that take up nutri
What are the hormones secreted by the adrenal medulla? What are their respective functions? The medullary portion of the adrenals secretes hormones of the catecholamine group:
What is HMP pathway? Give any two points of its significance The HMP is an alternate oxidative pathway for the metabolism of glucose. The significance of the pathway is that
What is Embryogenesis explain in detail? Embryogenesis in humans consists of the first eight weeks of development of the zygote. Embryogenesis in animals is generally divided i
Identify and briefly explain the structural and functional changes that occur in the large bowel when colorectal cancer develops.
what is respiration
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