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Carbon dioxide and water.

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How does photosynthesis and cellular respiration form a cycle?

The two chemical reactions essentially form a cycle, in that the products of one reaction fuel the other. CO2 and H2O released from cellular respiration reenter the atmosphere and are recycled by photosynthetic organisms, which in turn produce the sugars and oxygen needed for respiration to occur once more. This is right! :) Follow me on twitter! @diamondiemeary twitter.com/diamondiemeary myspace.com/diemeary


What specialized fluid is formed in the tissue spaces and transported by way of the specialized lymphatic vessels to eventually reenter the circulatory system?

Lymph is the specialized fluid that is formed in the tissue spaces and transported by lymphatic vessels to reenter the circulatory system. The lymphatic system plays a crucial role in immune response, fluid balance, and lipid absorption.


Why does water exit the blood by filtration but reenter by osmosis?

Water exits the blood by filtration in the kidneys to remove waste products and excess substances from the body. Subsequently, water reenters the blood by osmosis to maintain the body's hydration levels and prevent dehydration.


What vessel does fat reenter the bloodstream through?

Fat reenters the bloodstream through lymphatic vessels known as lacteals. These vessels are located in the small intestine and absorb dietary fats in the form of chylomicrons, which are then released into the bloodstream to be delivered to tissues for energy or storage.


How can carbon reenter the atmosphere once it becomes part of an organism?

When an organism dies, the carbon it contains is broken down by decomposers like bacteria and fungi. This decomposition process releases carbon back into the atmosphere in the form of carbon dioxide. Additionally, when organisms are burned or consumed by other animals, carbon is also released back into the atmosphere as carbon dioxide.