Question

which experiments led to changes to the original cell theory?
experiments that showed that blood cells transport gases, waste, and nutrients throughout the body
experiments that showed that all cells are similar in how they metabolize and in their composition
experiments that transplanted synthetic chromosomes into bacterial cells to create a new species
experiments that established the existence of single - celled organisms and microbes

Explanation:

The original cell theory had several tenets. The discovery of single - celled organisms and microbes was part of the early understanding of cells. However, experiments that transplanted synthetic chromosomes into bacterial cells to create a new species are more relevant to modern cell theory changes. This is because it challenges and expands the traditional view of what a cell is and how it can be manipulated. The original cell theory stated that cells come from pre - existing cells. Creating a new species by transplanting synthetic chromosomes shows a more complex and engineered form of cell origin and evolution, which is a change to the original theory.

Answer:

experiments that transplanted synthetic chromosomes into bacterial cells to create a new species