Method 1: Take a test tube, pour 1 ml of water, start 1 algae, put in the light, in a day see how many are in the test tube: take water samples and examine under a microscope.
Method 2: if we assume that 1 alga is formed per day, then you can calculate how many there will be in a month.
Method 3: clean the aquarium, pour clean water, put it in the light, start 10 algae. After a month, shake the contents of the aquarium, filter, weigh. Counting: knowing the weight (from the reference book) of one algae, find out their quantity, divide by time (month). For example: 4,009 bacteria were formed, divide by 30 days and we get the reproduction rate – 134 bacteria per day.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.