Juan and shanice took samples from around their classroom to grow bacterial cultures. after the bacterial cells has been growing for three days in the petri dishes, what is the most appropriate tool for them to use to measure the diameters of the colonies?

metric  ruler

Explanation:learned that the hard way

answer : haversian

[explanation: -(compact bone is organized as parallel columns, known as haversian systems, which run lengthwise down the axis of long bones. these columns are composed of lamellae, concentric rings of bone, surrounding a central channel, or haversian canal, that contains the nerves, blood vessels, and lymphatic system of the bone)]