These groups are not in order. Write them in the order in which they appeared, earliest first, by…
Contributed by StemPy LabTry it on paper first. A hint, the key idea and the worked solution are here when you need them.
These groups are not in order. Write them in the order in which they appeared, earliest first, by the NCERT account.
- Reptiles
- Fish with strong fins
- Amphibians
- Mammals
- Invertebrates
- Jawless fish
- Write the right order.
- Which group gave rise to the amphibians?
- Which group gave rise to the reptiles?
Need a reminder? The key ideaShow
Order in time: first cells, invertebrates, plants on land, fish with strong fins, amphibians, reptiles, mammals. A strip of cm for million years has one centimetre for million years, so a distance from the left end is .
The worked solution
Have you tried it?
Work it out on paper first. It is fine to get stuck or make a mistake: that is how we learn. When you are ready, go through the solution one step at a time, and check each step against your own.
Step 1. (a) The order is : invertebrates, jawless fish, fish with strong fins, amphibians, reptiles, mammals.
Step 2. (b) The fish with strong fins, the lobefins, gave rise to the amphibians.
Step 3. (c) The amphibians gave rise to the reptiles, which lay thick-shelled eggs.
Answer: invertebrates, jawless fish, fish with strong fins, amphibians, reptiles, mammals; lobefins; amphibians.
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