Question

1. what event occurred during the paleozoic era?

dominance of non - avian dinosaurs
diversification of mammals
first appearance of most modern invertebrates
beginning of multicelled life

Explanation:

1. Analyze each option:

• "dominance of non - avian dinosaurs" occurred during the Mesozoic era, not the Paleozoic.
• "diversification of mammals" mainly happened in the Cenozoic era.
• "beginning of multicelled life" was in the Precambrian.
• The Paleozoic era is known for the first appearance of most modern invertebrates (like trilobites, brachiopods, etc.).

Answer:

C. first appearance of most modern invertebrates