Whoever gets this right gets 50 points and est.( no links) What unit of time is the earliest span of time in Earth’s history? are divided into and periods can be further divided into .

What are the 3 eras of geologic time?

Identify the era in which the following occurred:

Reptiles become dominant at the end of the era

Flowering plants became most common

Kinds of mammals increased

Dinosaurs became extinct

Seed plants were common by the end or the era

New mammals appeared while others became extinct

Formation of supercontinent Pangaea

Began with early invertebrates

Small mammals and birds appeared

Early vertebrate fish

Break-up of Pangaea

Flowering plants appeared at the end of the era

Early land plants (simple mosses and ferns)

Reptiles (including dinosaurs) dominated this era

Cone-bearing plants appear

First amphibians appear

Humans are a part of this era

Arachnids and insects appear

Diversity of life forms increase

Present Day Earth is in this era

Mass extinction of most marine invertebrates and amphibians

What are some events that can produce rapid changes to environmental conditions?

What typically results from these global events?

What marks the end of the Mesozoic Era?

What effects can explosive volcanic activity have on Earth?