Which element is most important for adding strength to hair, feathers, and outer skin?

oxygen

hydrogen

sulfur

phosphorus

A scientific study looked at the effect of tanning beds on DNA damage. The scientists took skin cells and exposed them to UV radiation (the type used in indoor tanning beds) for different lengths of time: some for 1 minute, some for 5 minutes, some

Which statements best describes the exosphere?

What does the Murphree Water Treatment Plant use to disinfect the water? A - nitrogenB - OxygenC - PhosphorusD - IodineE - Chlorine

What mechanisms do plants use to load sucrose produced by photosynthesis into specialized cells in the veins of leaves? A) an electrogenic pump B) a proton pump C) a contransport protein D) A and C only E) A, B, and C

How could genetic drift explain differences in the genotype frequencies among the caucasian and aborigine populations?

The narrowest taxon in the Linnaean system is the genus, order, or species

What food source is available to animals in benthic zone and marine habitats

The process of breaking down a larger molecule, called a ploymer, into its monomets is called what

Carol is enjoying eating her dinner. While eating, she notices that her saliva secretion is higher than normal and that she feels good and relaxed. What causes this relaxed state?

What is the difference between bacillus, coccus, and spirillum