Question

1. number the events based on how long ago they happened. 1 happened the longest ago, and 10 happened the shortest time ago

oxygen levels in the atmosphere increase__\tfirst flowering plants appear__
dinosaurs die out__\thumans land on the moon__
oldest rock found 2__\tfirst evidence of life__
large carnivores appear__\tfirst fish fossils__
2nd largest mass extinction__\tfirst mammals appear__

Explanation:

Step1: Know geological - time scale facts

The oldest event among these is the formation of the oldest rock. After that, the first evidence of life appeared. Then oxygen levels in the atmosphere increased. After that, first fish fossils emerged, followed by the appearance of large carnivores. Then the second - largest mass extinction happened. After that, dinosaurs died out. Then the first flowering plants appeared. After that, the first mammals appeared. And the most recent event is humans landing on the moon.

Step2: Assign numbers

Oldest rock found: 1
First evidence of life: 2
Oxygen levels in the atmosphere increase: 3
First fish fossils: 4
Large carnivores appear: 5
2nd largest mass extinction: 6
Dinosaurs die out: 7
First flowering plants appear: 8
First mammals appear: 9
Humans land on the moon: 10

Answer:

Oxygen levels in the atmosphere increase: 3
First flowering plants appear: 8
Dinosaurs die out: 7
Humans land on the moon: 10
Oldest rock found: 1
First evidence of life: 2
Large carnivores appear: 5
First fish fossils: 4
2nd largest mass extinction: 6
First mammals appear: 9