What element is used as a shield to protect people from radioactive substances?

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

In a ni-cd battery, a fully charged cell is composed of nickelic hydroxide. nickel is an element that has multiple oxidation states. assume the following proportions of the states: nickel charge proportions found 0 0.17 +2 0.3 +3 0.33 +4 0.5 (a) determine the mean of the nickel charge. enter the answer to 2 decimal places.(b) determine the cumulative distribution function of nickel charge.

Which organism develops breathing organism develops breathing organs from pharyngeal arches? shark, spider, sea star, sea horse