Which labels would correctly model photosynthesis?

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

According to the big bang theory, after the "bang," the universe remained dark until about  300,000 yearsone billion yearsthree minutesthree billion years  later, when neutral atoms began to form.

Hybrid instruments that play sounds that are part sampled and part synthesized are known as: