Scientists study fossils in order to
a. predict how a species will react to weather
b. learn how species changed in the past
c. learn about what types of species will evolve in the future
d. predict weather patterns

Using meiosis, the sporophyte produces spores that are .

Kinases add - groups to other enzymes. this activities some enzyme while inhibiting other

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