Anton van leeuwenhoek is a scientist who saw cells soon after hooke did. he made use of a microscope containing improved lenses that could magnify objects almost 30ox. under these microscopes, leeuwenhoek found moving objects that he named "animalcules," which included protozoa and other unicellular organisms, like bacteria. he was also able to observe red blood cells and sperm cells. to which of the tenets of the cell theory did leeuwenhoek make the biggest contribution?

As a small change in a person's dna can cause a genetic disorder

Aresearcher designed an investigation to test what effect eating different types of food would have on blood insulin levels. she selected 10 male subjects who were all 25 years of age and in good health. the experiment took place over 3 days. at 8: 00 a.m. on each day, the subjects ate a meal consisting of only 1 type of food. they had their blood insulin levels measured after consuming the meal. on day 1 they ate a high fat diet, on day 2 they ate a high protein diet, and on day 3 they ate a high sugar diel what is the independent variable in this experiment? a the age of the subjects b the blood insulin level c the type of food consumed d the time of day the meal was consumed

Eutrophication caused by human nutrient pollution.