The following question refers to the generalized life cycle for land plants shown in the figure. Each number within a circle or square represents a specific plant or plant part, and each number over an arrow represents meiosis, mitosis, or fertilization.A generalized cycle for land plants consisting of two parts that have marks 2n and n respectively. In the first part the cycle starts with square 1, then arrow 2 leads to circle labeled 3. Arrow 4 enters the second part of the cycle and passes from circle 3 to four small circles that are labeled as 5 each. Arrow 6 passes from circles 5 to square 7. Then two arrows 8 have a note and/or and point to two circles that are labeled as 9 each. The arrows from circles 9 merge into single arrow 10. Arrow 10 enters the first part of the cycle and points to circle 11. Arrow 12 passes from circle 11 to square 1. The cycle is closed. In the figure, which number represents an embryo?

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