Biosphere II was an attempt to have humans live within a perfectly closed system, as a model for living on other planets. The first attempt failed becauae the system began losing CO2, which was chemically reacting with the exposed concrete walls. how would you go about designing a habitat that is a CLOSED sytem?

If the element whose electric configuration ends in the d sublevel, the element is calssified as? a. inner transition b. noble gases c. representative d. transition

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line