At two points close together toward the upper right of the diagram, since X and Y chromosomes are more advanced.
The Vmax of the enzyme is 12 μmol⋅min−1
We use Michaelis-menten equation, which is given by;

Where v is velocity of reaction
Vmax = maximum rate achieved by the system
[S] = concentration of a substrate
K
= Michaelis constant
Given V
= 10
[S] = 5km
Now, we calculate Vmax:
10
= 
Km = 1


=12 μmol⋅min−1
Learn more about Michaelis-menten kinetics here:
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Answer: Option D) China
Explanation:
From the picture provided, China and USA contributes above 5.000.000 ( In thousands of metric tons) of carbon dioxide emissions.
And since carbon dioxide has been implicated in the emergence of global climate change, both countries are leaders in the emission.
Thus, China is the right option
Answer: the mantle B
Explanation: Largest layer resulting in biggest mass.