✓ Accepted Answer
The theory of evolution by natural selection explains how species change over time. The core mechanism: within any population, individuals vary in traits. Some traits improve survival and reproduction in the current environment. Those individuals pass more genes to the next generation. Over many generations, the population shifts.
This isn't random chance. Natural selection is a sorting mechanism — it consistently favours traits that improve fitness in a given environment. But which traits help depends entirely on the environment. In a changing environment, evolution can happen surprisingly fast.
Evolution is supported by multiple independent lines of evidence: the fossil record showing gradual changes over time, genetic analysis showing shared ancestry, direct observation of evolution happening (bacteria developing antibiotic resistance, for example), and comparative anatomy showing homologous structures across species.
Humans share about 99% of our DNA with chimpanzees, about 85% with mice, and even about 60% with banana plants — we're not descended from chimps but share a common ancestor from about 6-7 million years ago.
by nokukhanyasithole59227
· 63 upvotes
Questions about vaccines usually fall into one of three categories, and knowing which one you're in changes the answer significantly.
**Category 1 — Conceptual:** You understand the goal but not how vaccines works mechanically. The fix here is to find the clearest possible explanation — not the most comprehensive one — and work through one complete example from beginning to end.
**Category 2 — Implementation:** You understand vaccines conceptually but something specific is not working. The most effective approach is to eliminate variables systematically: isolate the smallest possible failing case, confirm your assumptions about made one by one, and compare against a known-working reference.
**Category 3 — Design:** You can make vaccines work but you are not sure if you are approaching the system the right way for your situation. This one requires understanding your actual constraints — not the ideal constraints — and finding people who have solved similar problems in similar contexts.
Real-world observations sometimes deviate from idealized models — that's normal and worth understanding.
The diagnostic question that resolves most confusion about vaccines: "Am I working from a wrong assumption, or am I missing information?" Those two problems look similar from the outside but have completely different solutions.
Sontext and scale matter enormously in natural systems.
by avacote
When it comes to vaccines, the right answer depends heavily on what you are trying to achieve and what constraints you are working within.
**If your priority is flexibility to change direction:** then approaching vaccines by prioritising simplicity over completeness initially makes the most sense.
**If your priority is integration with existing systems:** then the calculus around made shifts significantly toward choosing the option with the strongest ecosystem.
The scientific consensus on this is well established across multiple independent lines of research.
For most people asking about vaccines: start with the simpler option and migrate once you have a real understanding of your situation. Beginning complex and simplifying later is far harder than the reverse.
Context and scale matter enormously in natural systems.
by leratokhumalo46927