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In the 1920s, two German embryologists, Hans Spemann and Hilde Mangold, demonstrated that a small patch of cells, called the dorsal lip of the blastopore, would
Q14: What components do all cells possess?
Q17: After seeds were planted, some of the
Q20: How is the placement of the eyes
Q22: A plant, by opening and closing its
Q38: Hair cells in the human ear are
Q46: Animals have enzymes that break apart starch
Q61: Explain how structures within the saccule would
Q64: The type of ion found in high
Q80: If a treeʹs heartwood rots out, the
Q91: What are the two main functions of