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unicellular organisms that do not have a proper nucleus or membrane bound organelles.
barrier made of coral (a living organism consisting of animal and algal tissues) that lies in...
an area of land which is usually covered with shallow water, and which supports plants adapted...
coiled thread-like structures of DNA and histone, which is a protein, in the cell nucleus. They...
an organ system that passes nutrients, gases, hormones, blood cells, etc. to and from cells in...
a system of support in soft-bodied animals, which relies on pressure of fluids in the body...