In the section "Investigating Life: Genetic Messages from Ancient Ecosystems," which of the following groups of animals was most likely to be present given the abundance of herbs and grasses and lack of vertebrate mitochondrial DNA in samples from Siberia 300-400,000 years ago?

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The abundance of herbs and grasses would suggest a thriving ecosystem that would support a diverse population of insects and arthropods. The lack of vertebrate mitochondrial DNA indicates a low presence or absence of vertebrates such as mammals, birds, amphibians, and reptiles.

In the Section "Investigating Life: Genetic Messages from Ancient Ecosystems