A seismograph station recorded the arrival of the first P-wave at 7:32 p. m. from an earthquake that occurred
4000 kilometers away. What time was it at the station
when the earthquake occurred?

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!

wild parsnip is a perennial plant which reproduces rapidly in areas which have no sign of agricultural activity such roadside or at no tillage open areas. it's considered invasive because it can inhibit the growth of another plant  and its reproduction is fast. there are several harmful effects of this invasive plant although its taproot is edible since it is a member of the carrot family. wild parsnips can cause skin blistering when in contact because of the chemicals it contains, second it inhibits the growth of other plants, it will restrict the growth of animals when eaten and lastly, it drives away natural pollinators like bees.