2. Misturando-se 1 litro de água a 65ºC, 2 litros de água a 55ºC e 3 litros de água a 30ºC, obtemos 6 litros de água a: a) 30ºC
b) 35ºC
c) 40ºC
d) 50ºC
e) 65ºC

28. evolution

29. environment, survive, offspring  

explanation:

luster is not a good characteristic to use by itself because luster is the property of minerals that indicates how much the surface of a mineral reflects light. the luster of a mineral is affected by the brilliance of the light used to observe the mineral surface.

report!

explanation:

physics means: "the branch of science concerned with the nature and properties of matter and energy. the subject matter of physics, distinguished from that of chemistry and biology, includes mechanics, heat, light and other radiation, sound, electricity, magnetism, and the structure of atoms."