by their epidermal layer
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yes, worms are made up of cells and all cells have a nucleus.
becaus eour body is more complex than insects and worms....
Worms do not have eyes. Worms do have light sensitive cells.
Roundworms get their oxygen buy absorbing the air through their skin
worms and spider cells
Red Blood cells help you get oxygen to your cells
Cells that do not get oxygen will die.
Red blood cells carry oxygen around the body and to the cells.
Hydra cells get oxygen through diffusion.
blood carry oxygen to cells
Hydra cells get oxygen through diffusion.