What is the time that dinosaurs and mammals appear in the fossil record?Multiple choice question.120 MYA150 MYA220 MYA320 MYA

Break Down the Problem

1. Identify the time period when dinosaurs first appear in the fossil record.
2. Identify the time period when early mammals appear in the fossil record.
3. Look for the options that match these time frames.

Relevant Concepts

• Dinosaurs first appeared during the Mesozoic Era, primarily in the Triassic period.
• Early mammals also originated during this period but became more prominent in the Jurassic.

Analysis and Detail

1. Dinosaurs emerged around 230 million years ago (MYA), during the late Triassic period.
2. Mammals appeared slightly earlier, also around the late Triassic but gained diversity notably during the Jurassic period.

Verify and Summarize

The key timeline indicates that both groups emerged during the Triassic period. Given the options provided, 220 MYA is the closest estimate to the actual emergence of these life forms.

Final Answer

220 MYA.