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1 All About Elements: Helium https://boreal.com/store/ boreal.com | 800-387-9393 2 3 Fun Facts About…Helium 1. Helium is the second most abundant ele- ment after hydrogen in the universe and solar system. Approximately 11.3% of all atoms in the un...

Working with Daphnia Diagrammatic Anatomy of a female Daphnia 1. Frontal organ 16. Carapace 2. Esophagus 17. Filter setae 3. Antennal adductor muscles 18. 2nd and 3rd thoracic appendages 4. Antenna 19. Shell gland 5. Antennal levator muscle 20. Ma...