The Latin name is from the Japanese name for T. sieboldii. T. canadensis and T. heterophylla were discovered early (before 1800) and until 1855 were simply treated as species of Pinus, but in 1842 T. sieboldii, the southern Japanese hemlock, was described as Abies tsugae.
The brains of the cell, the nucleus directs cell activities and contains genetic material called chromosomes made of DNA.
Animal cells have lysosomes for digestion, centrosomes to help with cell division and sometimes flagella to help with movement â none of these three organelles are found in plant cells The cells of animals lack cell walls, chloroplasts and vacuoles which are all found in plant cells Different types of specialized cells are found in different tissues and have features relative to their function e.g. nerve cells have axons and dendrites to send and receive messages.