Roughness of the surface and weight of the object.
Answer: 4 hours
Explanation:
It takes the kayak 1 minute to travel 35 meters.
Divide the total (8400m) by the amount of meters per minute (35m)

Now convert into hours. (Remember that 1h has 60min)
FALSE You are never allowed to stand on the top of the ladder even if all legs are on the ground
A gene is the basic unit of heredity, DNA a self replicating material and chromosome a structure of nucleic acids and protein.