Answer:
In all organisms, the instructions for specifying the characteristics of the organism are carried in DNA, a large polymer formed from subunits of four kinds (A, G, C, and T). ...
Most of the cells in a human contain two copies of each of 22 different chromosomes. ...
Changes in DNA (mutations) occur spontaneously at low rates.
The answer is A. Nucleus-forms peptide bonds
Respiration= oxygen is converted to CO2
Photosythiesis=sunlight is converted to food for the plant through the chloroplasts and then the plant lets out Oxyegen and takes in CO2
The first and last sounds most reasonable, but I will go with the last one.
