Food producer for the plant cell it converts the energy of the sun into sugar

I do not know what you are asking, but chloroplasts work yo convert the light energy of the Sun unto sugar that can be used by cells. It is kinda like a solar panel that changes sunlight energy unto electric energy. The whole process is called photosynthesis and it all depends on the little green chlorophyll molecules in each chloroplast.

Hope this helps.

in 1859, charles darwin set out his theory of evolution by natural selection as an explanation for adaptation and speciation. he defined natural selection as the "principle by which each slight variation [of a trait], if useful, is preserved".

not always but somethings can be reproduced in a laboratory.