What is meant by reproductive isolation? My teacher is wanting the class to get the answers from this website: https://flexbooks. ck12.org/cbook/ck-12-middle-school- life-science-2.0/section/4.9/primar y/lesson/origin-of-species-ms-ls

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

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

What is thought to have caused the mass extinction at the end of the cretaceous period?