What was anton van leeuwenhoek's contribution in the development of cell theory?

He developed and improved the microscope. He was also the first to discover single-cell organisms that he called animalcules.

He invented the first practical microscopes which was used to see bacterial cell.

Explanation:

Microscopic study was done by Anton van Leeuwenhoek who was a draper and he had a great interest in microscope. This helped in mixing the lens and making a microscope which was used to see cell.

This microscope had a magnification of 270 x, which was of great help when visualizing such a small organism that was not seen by naked eyes.

weathering - colorado river carves land in arizona to form the grand canyon. cracks form in a sandstone wall surrounding a house. a marble statue near the science museum is changing color due to rainfall

erosion - after a rainstorm, soil and rock piees litter the roadways. the sand dunes in the sahara desert are changing shape.

here's your answer.

the answer is c. altitude. hope this ! #brainiac