Answer:
Ribosomes
Explanation:
Rough endoplasmic reticulum, choloroplast and nucleus all are important organelles and are membrane bound except for ribosome
The immune system is spread throughout the body and involves many types of cells, organs, proteins, and tissues. Crucially, it can distinguish our tissue from foreign tissue — self from non-self. Dead and faulty cells are also recognized and cleared away by the immune system.
If the immune system encounters a pathogen, for instance, a bacterium, virus, or parasite, it mounts a so-called immune response. Later, we will explain how this works, but first, we will introduce some of the main characters in the immune system.
The most abundant elements in the body are hydrogen, oxygen, carbon, nitrogen, calcium, and phosphorous. Hope this helps.
