Which are segments of dna that code for specific traits?

A gene is a segment of DNA which encodes for  the production of proteins(building blocks of life) which provides structure to our bodies. These proteins carry out bodily functions and determine the physical characteristics of an organism.

Therefore the answer should be genes.

This is what i found on google “phytoplankton, tiny organisms that live in the ocean, are autotrophs. some types of bacteria are autotrophs. most autotrophs use a process called photosynthesis to make their food.” i hope this you for what your looking for