HELP PLEASE IM GONNA DIE IF I DONT PASS! To find the epicenter of an earthquake, a seismologist needs to know

Question 22 options:

the epicenter distance from 10 seismic stations.

the intersection of two circles from two seismographic stations.

the distances from three different seismic stations to the epicenter.

the difference in the arrival times of the P- and S-waves at a single seismic station.

Explain why the plants cortex would serve as the best food source for animals

The structure of a dna molecule is best described as a. one long strand of nucleic acids b. two strands of dna nucleotides joined by hydrogen bonds c. two strands of amino acids joined by hydrogen bonds d. one long strand of amino acids

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