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The pelagic food web, showing the central involvement of marine microorganisms in how the ocean imports nutrients from and then exports them back to the atmosphere and ocean floor. A marine food web is a food web of marine life. At the base of the ocean food web are single-celled algae and other plant-like organisms known as phytoplankton.
The mesenchyme contains all the internal organs and allows the passage of oxygen, nutrients and waste products. It consists of two main types of cell: fixed cells, some of which have fluid-filled vacuoles ; and stem cells , which can transform into any other type of cell, and are used in regenerating tissues after injury or asexual reproduction .
Bipalium species are predatory.Some species prey on earthworms, while others may also feed on mollusks. [10] [11] These flatworms can track their prey. [12]When captured, earthworms begin to react to the attack, but the flatworm uses the muscles in its body, as well as sticky secretions, to attach itself to the earthworm to prevent escape.
The placental tissue contacts the uterine wall in a unique structure called the "trophonematal cup", where nutrients are transferred from the mother's bloodstream into the placenta. [ 10 ] Female spadenose sharks probably mate at least once per year, and breeding takes place year-round.
The spiral valve is a coiled organ, it increases surface area so that nutrients can be absorbed. [11] The spiral valve then empties into the rectum and anus, then into the cloaca. Within the shark stomach, buoyancy is established from air taking up space and providing sharks the ability to float.
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Generally, marine vertebrates are much more nektonic and metabolically demanding of oxygen and nutrients, often suffering distress or even mass dyings (a.k.a. "fish kills") during anoxic events, while marine invertebrates are a lot more hypoxia-tolerant and exhibit a wide range of morphological and physiological modifications to survive in ...
Scalloped hammerhead: The scalloped hammerhead is viviparous, bearing its young after nourishing hatchlings internally. Cyphotilapia frontosa: The female Cyphotilapia frontosa mouthbroods its fry. The fry can be seen looking out of her mouth. Seahorses: Seahorse males practice pouch-brooding similar to kangaroos. When seahorses mate, the female ...
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