Studies of evolutionary responses to novel environments typically consider single species or perhaps pairs of interacting species. <span>
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I don't know if this is what you're looking for but,
the state in which sand and seawater are in are different. Sand is a solid and seawater is liquid.??
<span>The primordial germ cell in the embryo undergoes mitosis to produce a spermatogonial stem cell.
The spermatogonial stem cell undergoes mitosis. The new cells could either be stem cells or spermatogonium cells.
The spermatogonium undergoes mitosis to generate a primary spermatocyte.
*** Up until this point, all cells are diploid ****
The primary spermatocyte (diploid) undergoes MEIOSIS I to generate TWO haploid secondary spermatocytes.
Each secondary spermatocyte undergoes MEIOSIS II to generate a total of FOUR early spermatid.
The spermatid mature in the seminiferous tubule, and once they are completely mature they are released into the lumen.
Now called sperm cells, they pass into the epididymis, where they are stored until time to be released during ejaculation
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<span>In all eusocial species, sterile workers assist fertile relatives with whom they share genes.
Any colonial creature species that lives in multigenerational family bunches in which by far most of them participate to help moderately few (or even a solitary) reproductive group members are Eusocial species.
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