hom-O heidelbergensis was one of the early humans who appeared in about 200-130 kya in Asia and 600-130 kya 2in Africa and Europe.
These humans have long but lower cranium, cranial features resemble Hom Erectus but 1200-1300 cc cranial capacity with smaller pre/molars. The occipital torus of these humans was very small.
Cytoplasm is the organelle that keeps the other organelles together. The nucleus is the cell that conducts and instructs the cells activities. The ribosome contains RNA. Cell wall is the most reasonable.