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Q. In arthropods why isn't gas exchange done through cutaneous diffusion?
In arthropods the impermeability of the exoskeleton makes the way of gases difficult. In addition the new methods of respiration present in arthropods were preserved by evolution because they were more capable for those animals.
What are the main cells of which poriferans are made? Sponges have their outer wall covered by flat cells known as pinacocytes and having pores well-delimited by special cells
T hese are some important uses of biodiversity. 1. Source of food, medicines and drugs: (a) Wheat, rice and maize are three carbohydrate rich crops and contribute
topics for zoology assignment for plus one
ALEURONE GRAINS - Also known as Plant lysosome , because they contain hydrolytic enzymes. Consists of Proteins. They are also known as Aleuroplast because they are ric
Spermatogenesis In multicellular organisms the reproductive process commences with the production of gametes. The gametes are the sex cells that develop inside the gonads, th
Describe TS Murmur and their characterstic ? Characteristic: It is a rumbling, and diastolic murmur heard at left lower sterna border that increases with inspiration. An OS may
Explain Arthritis Arthritis - Oral therapy with doxycycline or amoxicillin for 28 days is usually effective for treatment of Lyme arthritis. Patients who have not responded to
What is the evolutionary importance of the emergence of seeds in the plant kingdom? The evolutionary significance of the seed is related to the plant capability of distant colo
Access burs through the crown: Carbide fissure burs : cut through metal ( amalgam alloy or cast metal ) or composite resin. Porcelain fused to metal : -A round diam
Difference between Blind Spot and Yellow Spot - Blind Spot Y ellow spot 1. It lies litte away from yellow spot. 2. No pi
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