1. During which stage of mitosis does the sister chromatids first separate? 2. What is the name of the string-like material that pulls the sister chromatids apart?

In terms of alternation of generations, the internal parts of the pollen grains of seed-producing plants are most similar to a ) moss sporophyteb) moss gametophyte bearing both male and female gametangiac) fern sporophyted) fern gametophyte bearing only antheridia

How can scientists test their ideas about the origin of the universe if they can't physically interact with or study?

What must be true for natural selection to heppen