MCQ
A study of fossils in different sedimentary layersindicates
- APhysiological period in which they existed
- ✓Geological period in which they existed
- CConditions in which they were living
- DAll of the above
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$R$-Sensory receptors help in monitoring the environment
$I$.Coelomic cavity $II$. Level of organisation $III$. Notochord $IV$. Skeletal structure
$R $: Such joints are also called Synovial joints and have almost frictionless movement due to synovial fluid.