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Invertebrates were formed and active about _______ million years ago.

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in Biology – Class 12 by (271k points)
Invertebrates were formed and active about _______ million years ago.

(a) 350

(b) 500

(c) 320

(d) 200

The question was asked in homework.

My enquiry is from A Brief Account of Evolution of Animals topic in chapter Evolution of Biology – Class 12

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Right option is (b) 500

The best I can explain: It was 500 million years back when the invertebrates were formed and active. Jawless fish and other fishes with strong stouts evolved around 350 million years ago. Seaweeds and few plants evolved about 320 million years ago.

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