Justin designed an experiment to find out how running up bleachers affects his heart rate. First he records his resting heart rate and then runs up the bleachers 10 times. Each time he reaches the top, he records his heartrate then rests 20 minutes.
Which is involved in Justin's experiment?
replication
repetition
both repetition and replication
neither repetition nor replication

african americans demonstrated their newly found freedom by relocating often in search of relatives whom they had been separated from during slavery. others established schools to educate freed people and they built institutions such as churches and political organizations to advocate for their rights.

i'm assuming that the correct answer is indeed the first one/ "a"..

its first and third is your answer i did the qustion the fourth isnt right

my dad did alot of meth and ace cheeks