Axes are now made out of steel instead of rock.
The size and design of the ax heads have changed.
Machines can be used in the manufacturing process.
There are more people today to work in the manufacturing process.
The boy had an hour in which to complete his tasks.
The boy spent only an hour with his father each day.
The boy was paid for only an hour of labor each day.
The boy had an hour in which to rest from his chores.
Control over the variables of interest
Access to modern equipment and research methods
Ability to make observations and accurately record data
Sufficient time to conduct a study and the amount of data recorded
He uses a simile to compare the crabs to the shadows.
He uses symbolism with the crabs representing the suspect.
He uses imagery to describe the frantic behavior of the crabs.
He uses an analogy of crabs scuttling and shadows approaching.
Muscle cells can hold more blood than other cells.
Muscle cells can divide and reproduce at a faster rate than other cells.
Muscle cells can work together to contract and relax while other cells cannot.
Muscle cells can move freely to different parts of the body while other cells cannot.
1.98 + p = 2.87
1.98 x p = 2.87
P - 1.98 = 2.87
P / 1.98 = 2.87
The American was not as good at using an abacus as his Japanese opponent.
The Japanese abacus user proved faster than the U.S. Army’s calculator operator.
The sound of the abacus’s shifting beads distracted the American calculator operator.
The U.S. Army’s calculator operator was not able to understand the abacus’s shifting beads.