Answer: Option A and B.
Organ system and tissues.
Explanation:
Earthworm is a segmented worm that belong to the phylum annelids. Earthworm has a close circulatory system just as human beings which means their blood circulate through a closed network of vessels which are connective tissues. Earthworm has a structure of 5 hearts and they are called aortic arches which are organ systems. These pump blood into network of vessels and it's flow through the body. From there, the blood move to dorsal blood vessel which send blood to the front of the Earthworm, then to the ventral blood vessel which send blood to the posterior. At the intestines, there are lateral vessels which carry nutrients away from the gut and to the body.
Robert hook is the one recognized vital role of the in internal environment and observers
The digestive enzymes can only recognize the structure of the substrate but can not recognize whether it is inside cell or from outside. So if there is no membrane, the enzyme will digest the structure of its own.
Anaphase is the answer. In metaphase the chromatids line up next to each other and the spindle attaches to the centroid. In anaphase, the chromatids are pulled apart into opposing sides of the cell by the spindle fiber
Answer:
The virus integrates into long-lived immune system cells and remains dormant in those cells for many years.HIV's ability to hide its instructions inside of cells where drugs cannot reach it.
