Answer:
the pistil
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Response:
The accurate responses are A and D
To clarify:
Russell's theory involves the natural gradients of protons, asserting that four billion years ago, alkaline solutions emerged, leading to slightly acidic oceans (with CO2 levels being approximately a thousand times higher, reacting with H2O to form carbonic acid which results in mildly acidic seas). Acidity signifies proton concentration levels, higher in oceans compared to vent fluids. This variation has resulted in a natural proton gradient across the vent membranes that favored an outside positive polarity, which resembles the electrochemical potential in contemporary cells. This potentially explains why the last universal common ancestors across the three biological domains developed proton pumps.
The active site of the enzyme accommodates a substrate. This leads to the formation of an enzyme-substrate complex as the enzyme binds with the substrate. Subsequently, a chemical reaction takes place where new substances, referred to as products, are generated.
Medulla oblongata (option C) refers to the region in the brain impacted in patients experiencing difficulties with respiration. This area plays a crucial role in managing essential bodily functions like breathing, heart rhythm, blood pressure, swallowing, and vomiting.