D. Exfoliation is the answer
The Gulf Steam
---------------------
If population size temporarily exceeds the environmental carrying capacity, deaths will increase until the population size returns to previous levels.
The first evidence was presented by Wegner when he hypothesized that all the continents once formed a single land mass called the Pangea before drifting apart. So, to fill in the blank, it would be that '<em /><em>neighboring continents [are] like jigsaw puzzle pieces</em>'
