Examlex
Which of the following allows group A streptococci to spread through tissues by breaking down blood clots?
Continental Shelf
The extended perimeter of each continent, submerged under shallow water, leading to a sharp drop-off known as the continental slope.
Southern Hemisphere
The half of Earth that is south of the equator, known for having reverse seasons compared to the Northern Hemisphere due to its orientation to the sun.
Alpine Tundra
An ecosystem located in the higher elevations of mountains, above the tree line and below the snow line. Compare with tundra.
Profundal Zone
The deepest zone of a large lake, located below the level of penetration by sunlight. Compare with littoral zone and limnetic zone.
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