The Palaeozoic, Mesozoic and Cenozoic eras
Answers are for parents and teachers.
1
Which eras and periods do the trilobite, dinosaur and mammoth belong to? Write it.
Trilobite – Palaeozoic (Cambrian to Permian); dinosaur – Mesozoic (Triassic–Cretaceous); mammoth – Cenozoic (Quaternary).
2
What per cent of marine species was lost in the end-Permian extinction and what does it show?
About 80–90 per cent; mass extinctions strongly influenced the course of evolution.
3
The Palaeozoic lasted about 287 million years and the Mesozoic about 186 million. How many million years together? (Number only.)
473
4
What evidence shows birds are related to dinosaurs?
Fossils of feathered dinosaurs (Archaeopteryx and others), similar skeletal structure and egg laying.
5
What can be done to reduce the loss of species today? Write two examples.
Protect reserves and habitats; avoid illegal hunting of wild animals and reduce waste and pollution.