well when they were around that was decades and centuries ago so the bones have probably deteriorated from being pushed so far down in the earth
The answer is carbon dioxide bro thats so easy and you could just look it up
Answer AND Explanation:
Very often, one type of organism or species in an ecosystem happens to be the same food source for other types of consumers. The different food chains that exist in an ecosystem therefore form a complex network called food web. Food webs are more complex than food chains and therefore there can be more than one primary producer thus increasing the flow of energy an ecosystem.
