| We have shown that the host animal participates actively in the inorganic carbon absorption for the photosynthesis of its symbiont. |
| Many scientists, however, attribute the similarity to an endosymbiotic origin of the red algal chloroplast from a blue-green algal symbiont. |
| The integration of the symbiont in the host's metabolism is sometimes so specialized that the symbiont is like a new cytoplasmic organelle. |
| If this is indeed so, then symbiont phylogeny should roughly correlate with host phylogeny. |
| The integrated symbiont is an organelle, in some way completely domesticated by its host. |
| The citizen is not one as an individual, but as a symbiont, having proved this in primary societies. |
