According to this tree, what percent of the species seem to be extant (in other words, not extinct)?

Which mantle is under the crust the upper mantle or the lower mantle i think it's upper let me know if i'm right

The condition in which joints are inflamed is bursitis select the best answer from the choices provided ot f

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