What is the ultimate role of ecological succession in an environment

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

All individuals have two alleles for a given trait. according to mendel's these alleles are passed down one each from both mother and father.

When fossil fuels are burned, carbon dioxide is released. how does this gas impact the environment?