Why pottassium is called trrafic policeman of plants explain briefly.

Describe the difference between a. a hypothesis and a theory and b. an observation and an experiment.

What occurs when a cell engulfs large food particals

Scientists often have to 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 number in an alternate form.