If a seismograph shows only p waves what does that tell scientists about the location of the earthquake in relation to the location of the seismograph

Hope this helps you, 

Earthquakes are being recorded by the use of a seismograph. If a seismograph detects p waves it means that the shaking is in the earth’s interior and is not yet felt in the surroundings. It is the kind of wave that dogs can feel before an earthquake happens. 

regulation of gene expression. gene expression can be regulated by various cellular processes with the aim to control the amount and nature of the expressed genes. these regulatory proteins bind to dna and send signals that indirectly control the rate of gene expression

explanation: