Why are radio waves not used to generate medical images?
A. The frequency of most radio waves is too low to allow them to pass through bones or other solid materials.
B. Radio waves tend to bend too much when they encounter solid materials to be used for generating accurate images.
C. Radio waves carry so little energy that they tend to pass through most atoms without an interaction taking place.

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.

answer is: nuclear fusion produces elements that are heavier than helium.

nuclei combine to form a heavier nucleus, releasing energy.  

for example, fusion of hydrogen atoms at the sun.  

this fusion nuclear reaction is in the inner core of the sun and hydrogen (atomic number 1) is conveted into helium (atomic number 2).  

the inner core is the central region of the sun and all solar energy is produced in the core by nuclear fusion.