What would life be like for autotrophs if there were no heterotrophs?

Crinoids, also known as sea lilies, appear to be sea plants but are not plants at all. crinoids are an echinoderm species which uses anchoring structures called holdfasts to attach themselves to the sea floor. crinoids were most abundant in pennsylvania during the mississippian period, which ranged from 375 to 320 million years ago. fossils of the crinoids shows that during most of this time pennsylvania was that provided favorable conditions for crinoid growth. a) glacial terrain b) a dry and sandy plain c) mostly mountain ranges d) covered by warm, shallow seas

Arrange these steps in the correct order to explain how a muscle fiber contracts

Use the table you made that compares the buffalo and wildebeest to explain why the wildebeest population increase more than buffalo population from 1970-1975. make some predictions about what the population of these two animals will look like in the future