What is structure 3 , and how does it help sustain life? A. Structure 3 is a mitochondrion, which is the site of cellular respiration Structure 3 is a chloroplast , which is the site of photosynthesis . C. Structure 3 is the cell wall , which gives the cell structural support . Structure 3 is the nucleus , which is the control center of the cell .

As scientists have investigated evolution from a variety of fields, they have found that some of darwin's orginal ideas were inaccurate or incomplete. t explanation provided by evolution was updated each time to reflect the new information they found. what does this suggest about the theory of evolution? it has become a stronger and clearer theory as new information is collected.