Is pyrite a heterogenous mixture

What are two types of woodlands found around the world? When the stars begin to huddle the earth soon to become a puddle? What is the fluid derived from excess tissue fluid and similar to plasma? When does a cyclist appear to be stationary with respect to another moving cyclist? What is an adpitive cell? What is a poygenic trait controlled by? When liquid is drawn into a graduated pipette why should the liquid level not to be allowed to fall below the calibration mark? When you add 100 joules of heat to a glass of water the temperature goes up When you add 100 joules of heat to water with ice cubes in it the temperature stays the same Why? Can energy cause substances to change phase? What are the US' most abundant resources? What is 5.8 trillion years? How many chromosomes does a moth have? What is a type of ecosystem with moderate climate and distinct seasons? How many hair cells do you have in each ear? Why is an herbivores diet more energy efficient than a carnivores diet Explain why? At room temeperature a substance with a melting point of 40 degrees celsius is? What do enzymes digest fat into? How could you predict the presence of a sigma or pi bond in a molecule? Why is an increase in methane more worrying than an increase in Carbon Dioxide? How many oxygen atoms are in (NH4)2SO4?