Science, say which one please and thank you!

You need to make 500ml of 7h9(+) media with 1x adn and 30ug/ml of the antibiotic kanamycin. your stock solutions are 10x adn and 30mg/ml of kanamycin. the solvent is distilled water. how much of each component will you need to make the desired final solution?

The cluster of developing cells from conception until birth is called an

What does the number 18.9984 represent in the image?