The Image shows rock strata from three different regions on Earth. Identify all the layers that contain an index fossil. F4
F4
F4
F1
F1
F1
F3
F1
F1
F2
F1
Region 1
Region 2
Region 3

The health, management and conservation of biodiversity, is a challenge facing ecosystems worldwide. the major factors that affect the health and function of the great barrier reef are climate change and pollution. which question investigates the effects of a biotic factor on the reef ecosystem?

Cells tend to have a relatively small and uniform size. why aren’t cells larger?

Which of the following matches the organisms described with the correct domain? a. bacteria--unicellular, eukaryotic organisms with cell walls that do not contain peptidoglycanb. archaea--multicellular, eukaryotic organisms that do not have cell wallsc. eukarya--single-celled and multicellular organisms, with a defined nucleus and a variety of nutritional sourcesd. bacteria--unicellular, eukaryotic organisms that always lack cell walls