We have to rewrite this correcting fragments and run on sentences can someone check my work below the original.

Scientists report (1) that creatures living in the deep sea are in danger of starving to death. Millions of undiscovered species live, in the deep sea. Creatures in the seabed are suffering from growing food shortages. Which may be a result of rising sea temperatures. Scientists believe that some species will die out, those that can survive on a low food supply will continue living. Not much is known about the creatures that live in the deep sea, not much is known about the changes in their diets. Scientists estimate that up to 10 million species live in the depths of the sea. Most animals of the deep rely on food chains that begin. In the lighted realms of the sea. Microscopic plants called phytoplankton. Capture the sun and start the food cycle. (2) Wherever there are animal droppings, there is a constant rain of organic matter (3) that feeds the bottom dwellers.

This is my rewrite:

Scientist report that creatures living in the deep sea are in danger of starving to death. Millions of undiscovered species live in the deep sea. Creatures in the seabed are suffering from growing food shortages, which may be a result of rising sea temperatures. Scientist believe that some species will die out, and those that can survive on a low food supply will continue living. Not much is known about the creatures that live in the deep sea, and not much is known about the changes in their diest. Scientist estimate that up to 10 million species live in the depths of the sea. Most animals of the deep rely on food chains that begin in the lighted realms of the sea. Microscopic plants called phytoplankton capture the sun and start the food cycle. Wherever there are animal droppings, there is a constant rain of organic matter that feeds the bottomf dwellers.

Ms.Sue please check my work. Thank you.

Scientist report<~~Something's wrong here; it needs to be either "Scientists report" or "A scientist reports" Which do you mean? that creatures living in the deep sea are in danger of starving to death. Millions of undiscovered species live in the deep sea. Creatures in the seabed are suffering from growing food shortages, which may be a result of rising sea temperatures. Scientist believe<~~?? that some species will die out, and those that can survive on a low food supply will continue living. Not much is known about the creatures that live in the deep sea, and not much is known about the changes in their diest.<~~typo? Scientist estimate<~~?? that up to 10 million species live in the depths of the sea. Most animals of the deep rely on food chains that begin in the lighted realms of the sea. Microscopic plants called phytoplankton capture the sun and start the food cycle. Wherever there are animal droppings, there is a constant rain of organic matter that feeds the bottomf<~~extra letter here dwellers.

I find no run-ons or fragments in your corrected version, but you need to correct those other places I marked.

Also, with one extra correction, "Phytoplankton" is a proper noun and needs to be capitalized.

Your revised version looks mostly accurate, but there are a few minor mistakes:

1. In the sentence, "Scientist report that creatures living in the deep sea are in danger of starving to death," the word "Scientist" should be "Scientists."
2. In the sentence, "Millions of undiscovered species live in the deep sea," the word "live" should be "live in."
3. In the sentence, "Those that can survive on a low food supply will continue living," the word "living" should be "to live."
4. In the sentence, "Not much is known about the creatures that live in the deep sea, and not much is known about the changes in their diest," the word "diest" should be "diet."
5. In the sentence, "Wherever there are animal droppings, there is a constant rain of organic matter that feeds the bottomf dwellers," the word "bottomf" should be "bottom."

Here is the corrected version:

Scientists report that creatures living in the deep sea are in danger of starving to death. Millions of undiscovered species live in the deep sea. Creatures in the seabed are suffering from growing food shortages, which may be a result of rising sea temperatures. Scientists believe that some species will die out, and those that can survive on a low food supply will continue to live. Not much is known about the creatures that live in the deep sea, and not much is known about the changes in their diet. Scientists estimate that up to 10 million species live in the depths of the sea. Most animals of the deep rely on food chains that begin in the lighted realms of the sea. Microscopic plants called phytoplankton capture the sun and start the food cycle. Wherever there are animal droppings, there is a constant rain of organic matter that feeds the bottom dwellers.

Your rewrite looks good overall, but there are a few changes that can be made for clarity and proper sentence structure. Here is the corrected version:

Scientists report that creatures living in the deep sea are in danger of starving to death. In the deep sea, millions of undiscovered species live. Creatures in the seabed are suffering from growing food shortages, which may be a result of rising sea temperatures. Scientists believe that some species will die out, while those that can survive on a low food supply will continue living. Not much is known about the creatures that live in the deep sea, and not much is known about the changes in their diets. Scientists estimate that up to 10 million species live in the depths of the sea. Most deep-sea animals rely on food chains that begin in the lighted realms of the sea, where microscopic plants called phytoplankton capture the sun and start the food cycle. Wherever there are animal droppings, there is a constant rain of organic matter that feeds the bottom dwellers.

Overall, your revision is much better in terms of correcting fragments and run-on sentences. Great job!