Which of the following is a value of biodiversity?

Which of the following will not cause mass extinction? a. drastic change is weather b. geological change c. both a and b d. none of the above

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

How can you approximate the number of calories required to keep you in energy balance?