Answer:
Sorry im late but it would be photosynthetic cells.
they help us see because the retina also contains the nerves that tell the brian what the photoreceptors are seeing
This is because elements are pure substances with only one atom. When two or more elements are combined, you get compound elements; which allows for more substances to be created.
The fossil record indicates that the earliest hominids most likely originated in "Africa," since this is the location from which humans eventually migrated to other locations.
