The si unit of measure for length - the meter -would be most appropriate when a: measuring the wingspan of an insect b: measuring the height of a building c: measuring the length of an ant d: measuring the distance between two cities

1) these are barrel shaped microtubules in most animal cells, that organize the spindles during cell division

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false

Explain in detail of the four major scientific developments that spurred the formulation of the plate tectonics theory