How fossils of species that lived on earth for short periods of time and were abundant and were widespread geographically ?

How did the research presented in the article affect scientists' understanding of the evolution of eukaryotes

Which type of neuroglia is found outside of the brain?

The observations of hooke and van leeuwenhoek documenting the existence of microscopic cells formed the basis of what important theory? a. the cell theory stating that all living things are composed of cellsb. the theory of spontaneous generation, which held that life forms could arise spontaneouslyc. the theory of chemotherapy, or use of antimicrobials to destroy pathogenic organismsd. the germ theory of disease and causative agents