B) oxygen
Respiration is defined as the movement of oxygen from the outside air to the cells within tissues
Cancerous tumors are removed so that they do not metastasize. Some cancers are even curable if they are caught early. At other times both cancerous and benign tumors will be removed if they interfere with the function of an organ in some way. Sometimes a tumor may be removed for the purposes of a biopsy. Physicians may not always remove tumors. In many cases of metastatic cancer, the removal of a tumor is of no medical benefit.
Hope this helps. :D
Answer:
"The roots of the plant do not make the food. Thus, the answer to this question is letter B. The roots hold the plant in place and through them the minerals and water from the soil. The roots is also involved in the vegetative reproduction and competitions with other plants."
