Bivalves are protostomes, as they belong the to phyla Protostomia. They are freshwater/marine molluscs, whose body is covered by a protecting shell. They do not have a head, and some of their examples include oysters, clams, mussels etc.
A control group take no part in any experiment, they simply do what they do normally in order to compare the results from someone who has done something differently (experiment) and someone who hasn't. Hope this helps
An unspecialized cell that can divide and give rise to different specialized cells is called a stem cell (Figure above). Zygotes and embryonic cells are both types of stem cells. These stem cells, called embryonic stem cells, can divide indefinitely and can specialize into any cell type. They are totipotent.
This is called emigration
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what website or book is that?
