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Are the extraembryonic membranes the same in all vertebrates?
The presence of each extraembryonic membrane varies according to the vertebrate class.
In fishes and amphibians only the yolk sac is present. In reptiles and birds besides the yolk sac there are also the amnion, the chorion and the allantois. In placental mammals besides all these membranes the placenta is present too.
What are some diseases characterized by progressive loss of the axonal myelin sheath? Multiple sclerosis is a severe disease caused by progressive destruction of the myelin she
ANTIBIOTICS - Chemicals produced by microorganism that inhibit the growth of other microorganism. Such microorganism which produces the antibiotics are antibiont . Wh
How does phosphocreatine act in the muscle contraction and relaxation? Phosphocreatine is the main means of energy storage of the muscle cells. During relaxed periods ATP mo
Cholesterol is a steroid. It is very significant constituentof cell membranes in mammals, it modulates their fluidity. Cholesterol is also the precursor of steroid hormones such
Phylum Arthropoda : (8,00,000 to 10,00,000 species) They are known as 'jointed footed' animals. The appendages are paired, and jointed with chitinous exoskeleton, varied and wi
Define requirement of energy for Physical activity? This is the most variable and, after BMR, the second largest component of daily energy expenditure. Humans perform obligator
mORPHOLOGY OF AMOEBA AND ITS ADAPTATIONS
WORKIN G OF EYE - Human eye is sensitive to light wavelenght ranging from 380 - 760 nm. Bees, ants, spiders and gold fish can see uttraviolet light which is invisible to hu
Give three examples of artificial selection. Include examples of both animals and plants. Answers will vary, but could include domestic cats, domestic dogs, cattle, sheep, an
Explain the introduction of history of mart disease? Cardio-vascular diseases (CVD) are the leading causes of death and disability both in the developed and the developing na
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