3Legumes, a family of plants with fruits or loments, have structures called nodules on their roots.
These nodules contain nitrogen-fixing bacteria
that convert free nitrogen from the air into
ammonia, which is utilized to make proteins
within the plant. What would be the long-term
effect of the loss of nodules containing nitrogen-
fixing bacteria on the legumes and their
ecosystems?

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