What is a fluid in which a substance is dissolved

Which pattern most likely came from a gunshot and which one was produced from a blow on the head? explain your answer?

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

Choose the diagram that best represents a habitat corridor explain your choice.