Perhaps the answer is "physical characteristics". I am simply making an educated guess, however I do know early philosophers classified organisms into two groups, Plants and Animals, and identified them based on physical characteristics.
Answer:
No, If that was the case, then we should only be eating carbohydrates.
It occurs in the first phase known as the Prophase. During this the chromosomes inside the cell’s nucleus condense to form tight structures.
Question/Purpose
research
Hypothesis
Experiment
collect data and analyze
Conclusion