1. Dinosaurs are reptiles that existed for a very long time. Which era did these organisms evolve? A. Cenozoic Era B. Mesozoic Era C. Paleozoic Era D. Proterozoic Era 2. What are the first photosynthetic organisms that grow well on earth? A. Bryophyllum' B. cyanobacteria C. stromatolites D. Zircon crystal 3. The oxygen revolution changed Earth's environment dramatically. Which of the following adaptations took advantage of the presence of free oxygen in the oceans and atmosphere? A. The evolutio
Answer (1)
1. B. Mesozoic Era Dinosaurs first appeared and dominated during the Mesozoic Era, which includes the Triassic, Jurassic, and Cretaceous periods. This era is often called the "Age of Reptiles."2. B. Cyanobacteria Cyanobacteria are ancient microorganisms that can do photosynthesis. They were among the first to produce oxygen, leading to the "oxygen revolution."
