3. Explicar las características de biodiversidad en cada región de nuestro país. Considerando estos aspectos: a. Flora b. Fauna c. Micro climas d. Imágenes 3.1 COSTA 3.2 SIERRA 3.3 AMAZONÍA 3.4 GALAPAGOS

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

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.

Apiece of metal with a length of 1.42 cm was measured using four different instruments. which of the following measurements is the most accurate?