10 Jun What was the Cambrian Explosion
uestion
What was the Cambrian Explosion?
The event that sparked the beginning of life on Earth.
The event that led to the extinction of the dinosaurs
The time when most animal phyla came into existence.
The moment when scientists in Cambridge University understood the phylogeny of life.
The history of the Earth is often divided into the Paleozoic, Mesozoic, and Cenozoic. Both the Paleozoic and Mesozoic eras ended with mass extinctions. The appearance and dominance of _____ plants in the Cenozoic Era created new niches for insects, as well as for birds and mammals.
moss
conifer
parasitic
flowering
fern
Name the type of symmetry found in an earthworm.
radial symmetry
no symmetry
etheric
bilateral symmetry
semi radial
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