Question

a student accidentally places red blood cells in pure water instead of a saline (salt) solution. after a few minutes, the cells swell and burst. what best explains this observation? the water is an isotonic solution, so no water movement occurred. the water is a hypotonic solution, causing water to move into the cells. the water has the same solute concentration as the cells, keeping them stable. the water is a hypertonic solution, causing water to leave the cells. what did anton van leeuwenhoek discover that contributed to the development of the microscope?

Explanation:

In osmosis, a hypotonic solution has a lower solute - concentration than the cell interior. Pure water is hypotonic to red - blood cells. Water moves from an area of lower solute concentration (pure water) to an area of higher solute concentration (inside the cell) by osmosis, causing the cells to swell and burst. Anton van Leeuwenhoek made significant contributions to microscopy by improving lens - making techniques to create more powerful single - lens microscopes.

Answer:

The water is a hypotonic solution, causing water to move into the cells.
Anton van Leeuwenhoek improved lens - making techniques for more powerful single - lens microscopes.