Match these items. 1. animal without a backbone clastic 2. animal with a backbone recrystallization 3. youngest on top unconformity 4. simultaneous deposition vertebrate 5. comparing rock columns superposition 6. missing rock graded bed 7. rock from particles correlation 8. crystal growth invertebrate

Idon’t know the answer and i’ve been stuck on it for a while now skskskskks

The image below shows a common blood pressure gauge. what does this device do? a. measures the level of oxygen present in the blood b. measures the pressure of blood when the lungs expand and compress c. measures the electrical activity of the heart d. measures the pressure of blood when the heart contracts and relaxes

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