Explain how geoscientist Tuzo Wilson resolved this question in 1963, and would (ii) provide additional evidence in support of the still
evolving Theory of Plate Tectonics.

Labor costs would be a large factor holding production of shade-grown coffee back. if it requires higher labor costs to receive a smaller benefit per hectare, then these costs would be prohibitive on expanding this practice to all coffee growing.

Psychologists often talk of the magical number "7" - so it is generally assumed that we can keep 7 (more or less, so 5-9 is the correct answer) items in our short term memory - we know this as a result of many experiments.

we can increase this by chunking, so for example "7 8 9 5 3" is harder to remember than "78 95 3" - try it yourself!

the answer is a)