Mobs
Blocks
Structures
Bosses
Ores
Biomes
Items
100

Villages are full of these

Villagers

100

The starting block

Wood

100

Contains the end portal

Stronghold
100

The end boss

The Ender Dragon

100

Iron Golems are made out of it

Iron

100

White stuff everywhere

Snow Biome

100

Skeletons use these

Bow

200

Basically Minecraft's mascot

Creeper

200

Obsidian but sad

Crying Obsidian

200

Pillager Tower

Pillager Outpost

200

3 heads

The Wither

200

You can use this to trade with Piglins

Gold

200

Rare island with Mooshrooms

Mushroom Fields

200

You can see really far with this

Spyglass

300

Has a rare pink variant

Sheep
300

You can combine Water and Lava to get these 2 blocks

Obsidian & Stone

300

Has a hidden laboratory where you can cure a zombie villager

Igloo
300

A destructive version of the Wither

The Wither Storm

300

Commonly found in the mountains

Emeralds

300
Most common spot for Emeralds

Mountain Biome

300

Blaze Powder + Ender Pearl = ?

Eye of Ender

400

You can get this mob by breeding a Horse and Donkey

Mule

400

These are rarely found inside of Woodland Mansions

Diamond Block

400

A way to implement illagers into the base of the game

Woodland Mansion

400

Only accessible through Java edition commands 

The Giant

400

Sometimes, two or more can generate close or even within eachother

Nether Fortress

400

Dense enough to get players lost

Taiga Biome

400

Primarily used to upgrade Diamond gear and craft lodestones

Netherite Ingot

500

The first ever Minecraft mob

The Human

500

These blocks are immune to fire and lava despite not being made of Netherite

Lodestone

500

They would generate in predetermined locations throughout the worlds

Brick Pyramid

500

This boss was able to hide the player's hunger and health bars

The Warden

500

They were originally called Emeralds

Diamonds

500

First added in v1.2.0

Savanna Biome
500

Rarest item in a Desert Pyramid

Enchanted Golden Apple