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(A) The process of seed development is considered an evolutionary precursor to the seed habit in plants.$1$. Heterospory is the production of two diff

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Heterospory

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(A) The process of seed development is considered an evolutionary precursor to the seed habit in plants.$1$. Heterospory is the production of two different types of spores (microspores and megaspores) by the plant.$2$. In heterosporous plants,the megaspore is retained within the parent sporophyte for variable periods.$3$. The development of the zygote into young embryos takes place within the female gametophytes retained on the parent sporophytes.$4$. This event is a precursor to the seed habit considered an important step in evolution,which is found in plants like $Selaginella$ and $Salvinia$.

Which of the following is considered significant in the process of seed development?

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