Question

question 63
the first flowering plants, first true mammals and first true frogs appeared during the:
a jurassic period
b cretaceous period
c triassic period
d permian period
e cambrian period

Explanation:

To solve this, we recall geological time periods and evolutionary events:

• Jurassic period: Known for dinosaurs, but flowering plants, true mammals, and true frogs' first appearance isn't here.
• Cretaceous period: Flowering plants (angiosperms) diversified, but their first appearance is in Jurassic? Wait, no—wait, correction: The first flowering plants, true mammals, and true frogs actually appeared in the Triassic period? Wait, no, let's recheck. Wait, the Triassic period is the start of the Mesozoic. Let's confirm:
• Triassic period: First true mammals, first true frogs (anurans), and first flowering plants? Wait, no, flowering plants (angiosperms) first appeared in the Jurassic or Cretaceous? Wait, recent research says angiosperms may have originated in Triassic, but traditionally, Jurassic or Cretaceous. Wait, the question's options: Let's recall the Mesozoic eras: Triassic, Jurassic, Cretaceous.
• Permian is part of Paleozoic, Cambrian too.
• The first true mammals, first true frogs (anurans), and first flowering plants (if we consider early angiosperm relatives) appeared in the Triassic period? Wait, no, maybe the question's answer is C. Triassic period. Wait, let's check standard biology/geology knowledge:
• Triassic period: Emergence of first mammals, first frogs (anurans), and early flowering plant ancestors? Or maybe the question's intended answer is C. Triassic. Wait, let's verify each option:
• A. Jurassic: Dinosaurs dominant, but mammals and frogs already present?
• B. Cretaceous: Flowering plants diversified, but first appearance?
• C. Triassic: Start of Mesozoic, first mammals, first frogs, first flowering plants (maybe).
• D. Permian: End of Paleozoic, before mammals.
• E. Cambrian: Explosion of invertebrates, no mammals or frogs.

So the correct answer is C. Triassic period.

Answer:

C. Triassic period