It shows the three organisms to have evolved from a common ancestor.
Explanation:
An identical sequence of amino acids for cytochrome c in cows, pigs and sheep show that they most likely evolved from a common ancestor. The common ancestor might have evolved over time and in result, three different species were produced. It also shows that they are more closely related to one another than other organisms.
Other properties or traits that are common in these organisms are :
Independent variable: The difference in the amount of water the plants are fed. Dependant variable: the health of the plants . Control variable: temperature, amount of sunshine, type of plant amount of co2,
