What groups of organisms did Antonie van Leeuwenhoek discover with his homemade microscope?

If a bottle of olive oil contains 1.4 kg of olive oil, what is the volume, in milliliters ( ml ), of the olive oil?

In salt water solution,the salt is the blank

Scientists often deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each of these numbers in an alternate form.