The width of a human hair is about 17 micrometers. how many human erythrocytes could fit across the width of a hair? how many ecoli bacteria could fit?

The galapagos island contain 13 species of finches four of the species are seen here it is believed that all of the species had one common ancestor and overtime

Did you know that a blue wales tongue weighs more than an elephant?

Sequence how oxygen accumulated in the atmosphere and the effect it had on life by completing the flowchart