What are preserved remains that shed light on past animals?

Introducing minvasive species to an ecosystem results in an increase in biodiversity is it true or false

Which of the following are not matched correctly? cd8+: directly destroy infected or cancerous cells t reg cell: reduce the adaptive response once threat passes t l: activate cellular branch (cytotoxic t cells, macrophages, nk cells) t 2: stimulate b cells to make antibodies t (cd4+): mhc i

Someone with these questions! pls 30 pts