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What are plankton, nekton and benthos?
Plankton, nekton and benthos are the three groups into which aquatic living beings may be separated.
The plankton is formed by the algae and small animals that float near the water surface carried by the stream. The nekton is composed of animals that actively swim and dive in water, as fishes, turtles, sharks, whales etc. The benthos comprises the animals ecologically linked to the bottom, containing many echinoderms, molluscs, benthonic fishes, crustaceans, poriferans and annelids.
RIBS- Curved or stretched 'S' shaped bones. 12 pairs, form thoracic basket, attached by head part to vertebral column and by tail part to sternum. 7 pairs a
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Take the prepared slide of Euglena and focus it first under low power and next under the high power of tlie microscope. Observe tlie following characteristics: i) Euglena is an
Number of Implants The use of more implants decreases the number of pontics and the associated mechanics and strains on the prosthesis, and dissipates stresses more effectively
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