I lurk

A modular, redundant genome where genes can be turned on and off conditionally, and where the regulatory elements that decide those conditions can be modified or swapped without altering the sequence of the main gene. This makes it easier to evolve new functional variants and adapt to new conditions.

Related, phenotype plasticity, i.e. the ability for a single genotype to generate multiple phenotypes depending on environment. A species with multiple possible phenotypes can easily split into multiple species specialized for different conditions; even if a phenotype is conditional at first, it can be made permanent by a later mutation (genetic assimilation).

More in general, imperfect correspondence between genotype and phenotype, i.e. DNA-is-not-a-blueprint. A protein can have more than function (protein promiscuity), multiple genes can affect the same trait in a non-additive way (epistasis), the same gene can affect multiple traits (pleiotropy).

Redundancy of DNA (multiple gene sequences result in the exact same protein) and multiploidy (multiple copies of each gene, the functional ones covering the bad ones) lead to the accumulation of mutations, some of which may be beneficial in the future, while limiting the damage of harmful ones.

Sexual recombination (fertilization to mix different lineages, and meiosis to make unique rearrangements of your parents' genes) increasing the genetic variability of offspring, while also limiting the buildup of harmful mutations (which would be an issue with a simple increase in the mutation rate).

Symmetry and modularity in body architecture, allowing to easily generate many specialized variations of a basic plan (and also making more likely that each variation is functional in the first place: you don't have to evolve each eye independently). Arthropod segmentation seems especially good, but all animals and plants have this to some degree.

no wait that- no that's not- no.

Unles you've like, poured out ALL OF YOUR BLOOD, used it for a spell, and then somehow SIPHONED THE WHOLE THING BACK IN, that doesn't mean the blood on the inside of you is also used. And even then, if you'd had your sacrifical blood IV'd back into your body-

actually nevermind, I need to draw a graph to illustrate:

🇨🇿 Nejmocnější voják v československých řadách.