Answer: B
Explanation: Adam Smith's theory of an invisible hand is a metaphor and therefore has nothing to do with a physical hand. In it self it's a theory that shows how in a free market economy, individuals with self-interest operating through a system of mutual interdependence, promotes the general benefit and good of society, mostly without any idea of the larger effect of their self-interested actions. A metaphorical hand that leads individuals to promote social interest by pursuing self-interest, option B, is therefore correct.
"The Calvin cycle, Calvin–Benson–Bassham (CBB) cycle, reductive pentose phosphate cycle or C3 cycle is a series of biochemical redox reactions that take place in the stroma of chloroplast in photosynthetic organisms. ... This set of reactions is also called carbon fixation. The key enzyme of the cycle is called RuBisCO."
D. is the heterotrophism hypothesis, but it is questionable that it is the "strongest" hypothesis. The alternately proposed option is autotrophism, which is the ability of an organism to obtain its own nutrients without relying on other organic materials. The potential advantage of autotrophism is its relatively simpler structure, making a simpler organism viable because it is potentially less complex and "easier to create."
Answer:
B: A location where 2 of Earth's plates meet
Explanation:
A boundary is the outer edge of something, and the entire Earth is covered with plates, so all boundaries are touching.
