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6. what happens to oxygen/nutrients which diffuse into multicellular organisms?
- The oxygen/nutrients are used up by the outer layers of cells and so will not reach cells deeper within the body
- The substances diffuse into cells in all layers
- The substances diffuse first in the deeper layers of cells, working their way to the outer layers
- The substances diffuse
7. For larger animals, diffusion is...
- the best transport system
- not an efficient system alone as not all of the cells are near their environment
- not an efficient system because it is too slow
- a better transport sytstem as the cells get the nutrients they are lacking in.