What are the keywords in the following sentence? olympic athlete leads the elite men over tower bridge during recurring competition
athlete, bridge, lead

What are the keywords in the following sentence? hundreds of protesters gather during a protest against politician .
gather, politician, protest

What are the keywords in the following sentence? Smoke is coming out of a train engine on the tracks.
come, engine, smoke

What are the keywords in the following sentence? linked genes number of genes in a cell is far greater than the number of chromosomes .
cell, chromosome, number