are they important to the ecosystem?
Yes, they eat sea grass and use beaches and sand dunes as to lay their eggs.
Sea turtle
In the oceans, sea turtles, especially green sea turtles, are among the very few creatures (manatees are another) that eat sea grass. Sea grass needs to be constantly cut short to help it grow across the sea floor. Sea turtle grazing helps maintain the health of the sea grass beds. Sea grass beds provide breeding and developmental grounds for numerous marine animals. Without them, many marine species humans harvest would be lost, as would the lower levels of the food chain. The reactions could result in many more marine species eventually becoming endangered or extinct.

Sea turtles use beaches and sand dunes as to lay their eggs. Such coastal environments are nutrient-poor and depend on vegetation to protect against erosion. Eggs, hatched or unhatched, and hatchlings that fail to make it into the ocean are nutrient sources for dune vegetation and therefore protecting these nesting habitats for sea turtles, forming a positive feedback loop.
those who argue today that behavior is no more than the action of chemicals UNANSWERABLE what is lamarckism? It is the notion that an organism can pass on to its offspring physical characteristics that the parent organism acquired through use or disuse during its lifetime. is it named after someone? It is inaccurately named after Jean-Baptiste Lamarck. who is he? He was a soldier, biologist, and academic. what is his view on religion? He referred to God as the "sublime author of nature". which species are named in his honour? The honeybee subspecies "Apis mellifera lamarckii" and the "Amelanchier lamarckii" (juneberry), to name a few. which ones has he named? The ark clams (Arcidae), the sea hares (Aplysiidae), and the cockles (Cardiidae), to name a few. how does the second species named in his honour, defends itself? UNANSWERABLE the second one that he named, how do they defend themselves? They spout ink when disturbed or attacked. what is its habit of mating? They can mate in pairs with one acting as a male, the other as a female, but they commonly occur in quite crowded numbers during the mating season, and this often leads to chains of three or more sea hares mating together. which animals prey on them? sea spiders, wrasses and sea turtles. what is the life span of the last one? UNANSWERABLE where can you find them? Australia, Gulf of Mexico and the East Coast of the United States, to name a few. what do they eat? Decapods, seagrasses, seaweed, sponges, mollusks, cnidarians, Echinoderms, worms and fish.
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Sea turtle [SEP] Importance to ecosystems
Sea turtles play key roles in two habitat types: oceans and beaches/dunes. In the oceans, sea turtles, especially green sea turtles, are among the very few creatures (manatees are another) that eat sea grass. Sea grass needs to be constantly cut short to help it grow across the sea floor. Sea turtle grazing helps maintain the health of the sea grass beds. Sea grass beds provide breeding and developmental grounds for numerous marine animals. Without them, many marine species humans harvest would be lost, as would the lower levels of the food chain. The reactions could result in many more marine species eventually becoming endangered or extinct.