Which statement correctly summarizes Wegener’s theory of continental drift? All seven continents have always been in the same locations on Earth as they are today. When a meteorite crashed onto the planet, it broke the giant supercontinent Pangaea into smaller landmasses. The seven continents on Earth drifted until they formed one giant supercontinent, which Wegener called Pangaea. Over tens of millions of years, the giant supercontinent Pangaea began to slowly drift apart, forming the continents as they are known today.

c

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i think

answer: the blood-brain barrier is a layer of specialized membranes and cell processes designed to keep undesirable substances from passing from the bloodstream into the precious tissues of the brain. while the blood-brain barrier does keep most bad things out of the central nervous system, it is not impermeable.

explanation:

many phylogenetic trees have a single lineage at the base representing a common ancestor. a lineage that evolved early from the root and remains unbranched is called basal taxon. when two lineages stem from the same branch point, they are called sister taxa.

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