PLEASE HELP! How did the occurrences of the different traits change over the 30-year period? Use evidence from the graph to support your answer. Using what you know about natural selection and adaptation, what generalization can you make based on these changes?

Those fish were prey.

Explanation:

It is clear to see that the utilization  of full body plates drastically increased and the usage of half body plates dramatically decreased. This is likely showing that these fish were heavily targeted, and therefore, needed to use better defensive mechanisms; hence the usage of full body plates compared to two-thirds or half. This is all showing these fish were likely prey for bigger fish, or perhaps non-marine predators as well.

As more protection for the stickleback fish was needed the more advantageous adaptation was more body plating, at first the two thirds body plating was rising in percentage and then the half body plating decreased then full body plating started appearing in more and more fish as the percentage of half body plating decreased significantly and the percentage of two thirds body plating leveled out

Explanation:

gametes or germ cells are haploid cells (example: sperm and ova) containing only one set (or n) number of chromosomes and autosomal or somatic cells are diploid cells containing 2n number of chromosomes.