I'm not exactly sure, but when
Humans are blessed with five sensory organs such as eyes, ears, nose, tongue and skin which are influenced by the change in the environment.
Sensation refers to sensing the outer environment with the help of the sensory organs in the form of touch, smell, sound, taste and sight. According to the environmental conditions, the sensory organs act and send the message to the brain which is then interpreted. For example, change in the environmental temperature such as hot or cold is sensed by the skin and interpreted by the brain.
Cancer cells are cells that basically bypass any sort of regulatory processes in the cell cycle (and mitosis - the splitting of the cell). This leads to uncontrollable cell growth/duplication which hence leads to more and more cancerous cells. Cancer itself is so hard to cure for a couple of different reasons. If the cells are in the form of a benign tumor, that is a tumor that does not spread from its original infected tissue, it should be "easy" to remove with surgery. However, if it metastasizes, or spreads into surrounding tissues through the lymph or blood systems, then it becomes even harder to remove because of its far reach and complex structure. Also, cancer cells can be simply described as normal body cells that have gone rogue. That being said, things such as antibiotics, that are designed to get rid of foreign bodies, cannot get rid of cancerous cells without getting rid of most of your regular body cells as well simply because they cannot tell the difference.
Hope this helps :)
The answer would be A, an electron is found outside of the nucleus.
