2hcl + na2o → xnacl + h2o which value of x will balance the equation?

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

People with one sickle cell allele are not likely to get malaria. what is this an example of?

What are ways that ordinary people can to keep antibiotic resistance from getting worse?