Match each term with its definition. FREE

alloy

the ability of metals to be formed into

wires

electron sea theory

the ability of metals to be shaped by

hammering or pounding

ductility

the bond formed when metal atoms

share many mobile electrons

malleability

metals bond to other metals by

sharing many "floating" electrons

metallic bond

a mixture of the atoms of a metal with

another element

Over the past 60 years, many amphibian species have experienced significant population declines and some species have become extinct. scientists suspected that local human activities such as the destruction of wetlands, regional pollution, and deforestation were the main reasons for these losses. however, research over the past 20 years reveals significant amphibian population declines in protected areas of the world, such as nature preserves and parks. these global declines suggest widespread problems including increased ultraviolet radiation, acid rain, and disease. in switzerland, for example, 14 of the 20 native amphibian species are threatened with extinction. chytridiomycosis is a fungal disease first identified in 1998 as a cause of massive amphibian deaths. in some severely impacted populations, a few individuals have survived, perhaps because of some natural resistance. if these resistant individuals continue to survive and prosper, new resistant populations might emerge. this would be an example of the founder effect artificial selection genetic drift natural selection sexual selection

Archaebacteria use for movement. celia flagella pili cell walls

Pulmonary arteries carry highly oxygenated blood. true or false?