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

if you add everything up correctly you should get 69 i got this because 50 plus 19 is it

the oldest known insects are believed to live around 400 millions ago as suggested by the fossil records.   some plants having woody stems also evolved during this time.

after the evolution of insects the first four legged species or the tetrapods evolved in shallow freshwater habitats from the intermediate species approximately 397 million years ago. the tetrapods went on conquering the land giving rise to amphibians, reptiles, mammals and birds.

the major split in tetrapods first occurred 340 million years ago branching off from amphibians.

363 million years ago when the carboniferous period began the insects started roaming on land and taking flights, following which the four limbed tetrapods adapted in the terrestrial habitat.

these muscles maintain the blood pressure in the vessels. the smooth muscles are innervated by nerves of the autonomic nervous system. when the muscles contract, they cause vasoconstriction of the vessels and increase blood pressure. when the muscles relax, they enable vasodilation of the   blood vessels hence reduce blood pressure.