Answer:
Average speed = total distance / total time
= 68 / 1 5/12 [ change 1 5/12 to an improper fraction - 17/12]
= 68 / 17/12 [perform division]
= 68 * 12/17
= 48 miles per hour
Answer: we can make observations directly by seeing, feeling, hearing, and smelling, but we can also extend and refine our basic senses with tools: thermometers, microscopes, telescopes, radar, radiation sensors, X-ray crystallography, mass spectroscopy, etc. And these tools do a better job of observing than we can!
Two identical copies formed by the replication of a single chromosomes
