Which hypothesis most likely explains the results at 60°c and 70°c

The correct option is B. The Enzyme or substrate has been changed.

Explanation:

Enzymes can be described as biological catalysts which speed up a reaction. Each enzyme is specific for a particular substrate. Enzymes work best at a particular pH and temperature known as optimum pH and optimum temperature.

As the temperature is raised, the working of the enzyme enhances. It becomes most efficient at a particular temperature which is known as the optimum temperature. If the temperature is raised beyond this optimum temperature, then the working of the enzyme starts to decline. Eventually, the enzyme loses its shape and is not able to fit the substrate into its active site. So, activity of the enzyme stops.

oxygen is the first element in group 16 (via) of the periodic table. the periodic table is a chart that shows how chemical elements are related to each other. the elements in group 16 are said to belong to the chalcogen family. other elements in this group include  sulfur, selenium, tellurium,  and  polonium.  the name chalcogen comes from the greek word  chalkos,  meaning "ore." the first two members of the family, oxygen and sulfur, are found in most ores.

oxygen is by far the most abundant element in the earth's crust. nearly half of all the atoms in the earth are oxygen atoms. oxygen also makes up about one-fifth of the earth's atmosphere. nearly 90 percent of the weight of the oceans is due to oxygen. in addition, oxygen is thought to be the third most abundant element in the universe and in the solar system.