What affects the level of available missions?

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When you begin a new save file, all the missions that can be selected are green (level 1) and short. Gradually, I've noticed more and more medium and long missions as well as yellow (level 3) missions.
What triggers these missions showing up? The possibilities I can think of are:
- Average level of your heroes
- Highest level of your heroes
- Number of weeks passed
- Number of heirlooms collected
- Number of missions completed
- Number of bosses defeated
Finally, is there a point where level 1 missions no longer appear?
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Can Alpha clones do level 4 missions?
Alpha clones They may add skill points to skills in the Alpha set up to 20.5 million skill points with skill injectors. They take twice as long to train skills. They pay an additional 2% tax on any industry job (e.g. manufacturing or research) They cannot accept any Level 4 or Level 5 missions from agents.What counts as a mission in Save the World?
Missions are the core game play element of Save the World. Each mission has a main objective and a variety of side objectives. Entering a mission is the only way to complete Quests, and use Weapons, Traps, Heroes, and Defenders.How do you get Level 2 security missions in EVE?
Get social skill to 3, then get Connections skill to 3. Once connections is at 3, you will get lvl 2 missions.How often can you decline missions EVE Online?
You are allowed to decline one (1) mission every four (4) hours without being penalized, if you do decline more than one mission you will be penalized, this means a loss in standing with the Agent itself as well as the Agent's Corporation and if it's a Storyline mission then you will also take a Faction standing hit.Tips \u0026 Tricks | Introduction to Missions
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