Arrange the following organisms chronologically in terms of their evo...
The correct answer is option 'A' (3-1-2-4).
Explanation:
1. Fishes: Fishes are the oldest group of vertebrates, with their origins dating back to over 500 million years ago during the Cambrian period. They are considered to be the first animals with backbones. Fishes have evolved various adaptations to survive in aquatic environments, such as gills for breathing, fins for swimming, and scales for protection.
2. Birds: Birds evolved from a group of dinosaurs called theropods during the Mesozoic era, specifically in the Jurassic period, which began around 201 million years ago. The evolution of birds involved the development of feathers, which initially served for insulation and display but eventually allowed for flight. Birds are warm-blooded animals with beaks, wings, and lay hard-shelled eggs.
3. Corals: Corals are marine invertebrates that belong to the phylum Cnidaria. They first appeared in the fossil record during the early Ordovician period, which started around 485 million years ago. Corals form colonies and build calcium carbonate exoskeletons, creating complex reef ecosystems. They have a symbiotic relationship with photosynthetic algae called zooxanthellae, which provide them with energy through photosynthesis.
4. Flowering plants: Flowering plants, also known as angiosperms, are the most recent group to evolve among the organisms listed. They appeared during the Cretaceous period, which began around 145 million years ago. Flowering plants have distinct reproductive structures called flowers, which contain ovaries that develop into fruits. They have evolved various mechanisms for pollination, such as attracting animals or wind dispersal of pollen.
Overall, the chronological order of these organisms in terms of their evolutionary periods is: Fishes (Cambrian period), Birds (Jurassic period), Corals (early Ordovician period), and Flowering plants (Cretaceous period).
Arrange the following organisms chronologically in terms of their evo...
Option a is correct.
- Chronologically, the following organisms evolved in the sequence given below:
1) Corals
2) Fishes
3) Birds
4) Flowering plants
- Evolution of life on Earth:
- Unicellular and multicellular organisms
- Age of Marine Invertebrates (early shelled organisms, Corals, first land plants, etc.)
- Fishes (First forests, first amphibians, etc.)
- Age of Amphibians (First reptiles, sharks, coal forming swamps, etc.)
- Age of Reptiles (Dinosaurs abundant, early flowering plants, placental mammals, etc.)
- Age of Mammals (spread of grassy ecosystems, modern humans, extinction of large mammals and birds during Ice age glaciations, glacial outburst floods, etc.)