What is the name of the organ, shown here, that makes the "lub-dub" sound in your chest?

Which best describes the scientific process

Food provides molecules that serve as fuel and building material for all organisms. plants undergo photosynthesis and make their own food. other organisms, like us and the horse seen above, are consumers and eat food. how do all organisms use food as fuel? be sure to include the name of the process in your answer. me.

When does dna replication(make a copy of itself)?