Viroids.
<span>Viroids enter the pollen and ovule, from where they are transmitted to the seed. When the seed germinates, the new plant becomes infected. Viroids can also be transmitted among plants by contaminated farm machinery and insects.</span>
<span>Chronic stress that weakens systems in the body.</span>
Answer:
Intron, Spliceosome, do not code for a protein
Explanation:
spindle-fiber structure because this is used to divide cells; cancer is just cells dividing way too much. so if the <em>spindle-fiber structure </em>were to fail it could cause cancer.
