Question

how do algae reproduce

Answer 1

Asexual reproduction is the production of progeny without the union of cells or nuclear material. Many small algae reproduce asexually by ordinary cell division or by fragmentation, whereas larger algae reproduce by spores.



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Answer 2

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Asexually.  Or through mitosis.  Green algae (or seaweed) actually can produce spores to combat risks of sexual homogeny of populations when exposed to shallower waters. 

 Just like bacterial colonies, they form multicellular collectives to better harness energy and accomplish the goal of life: reproduce.  They are from the kingdom Protista, and are the precursors of plants.  Plants developed meiosis and cellular codependency (specialization) as a response to the challenges of living on land.

This is similar to how slime molds diversified into fungi as they approached land.


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