Researchers have been studying how emissions from both volcanoes and human activities, such as the burning of fossil fuels, impact the atmosphere. Both types of emissions contribute to the total CO2 levels in the atmosphere. Graph 2 shows that atmospheric CO2 levels have been steadily increasing over time. This increase in CO2 levels has been linked to the increase in global surface temperatures.Explain why the total mass of carbon must be decreasing in a different step of the slow carbon cycle based on the on the increase in atmospheric CO2.

Answer:

C = chemical change, chemical property of reactivity.

Explanation:

Chemical change:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.

These changes are irreversible

These changes occur due to chemical reactions

These may not be observed with naked eye

Example:

The reaction of iron with air in the presence of water lead to the production if ion oxide which is called rusting. It is a chemical change.

Combustion of fuel or wood: that oil or wood convert into energy, CO2 and ash in case of wood

Boiling of egg: that change the chemical composition of protein in the egg

The reaction of Hydrogen and oxygen:

H 2 (g)  + O 2  (g) -------------------------------------> 2H 2O  (l)

Physical Change:                                                                                              

The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.

These changes were reversible.

They have same chemical property.

These changes can be observed with naked eye.

Example

Water converting to Ice

Water converting to gas

In this water molecule remain the same only they rearrange themselves that change its state of mater not composition

Answer:

C) Chemical Change; Chemical Property of reactivity

Explanation:

I took the test

Answer:

Option (2).

Explanation:

Enzymes are made of proteins that have the specific amino acid sequences. Enzymes have well determined 3D shape and work in their specific shape and at specific physical and chemical condition.

Enzymes may acts as catalyst that can increase the rate of the bio chemical reaction. Each enzyme is specific for one reaction and lowers the activation energy of the reaction. Enzymes increases the effective collision between the substrate molecule and increases reaction rate.

Thus, the correct answer is option (2).