I believe the most VALID answer to your question is "Homeostasis".
Organisms that carry out homeostasis do so in order to maintain a constant, optimum environment for the cells within their body.
Double-stranded DNA loops around 8 histones twice, forming the nucleosome, which is the building block of chromatin packaging. DNA can be further packaged by forming coils of nucleosomes, called chromatin fibers. These fibers are condensed into chromosomes during mitosis, or the process of cell division.
Each chromosome is made up of DNA tightly coiled many times around proteins called histones that support its structure.
During DNA packaging, long pieces of double-stranded DNA are tightly looped, coiled, super coiled, and folded so that they fit easily within the cell. This highly compacted DNA is then arranged into structures called chromosomes.
You could record how much they eat how many times they swim around in a day you could weigh your species of fish.
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It should be carbohydrates
