Identify the 4 organic (carbon-based) biological macromolecules. provide the building blocks (monomers) that make up these 4 macromolecules (polymers).

World class speed skaters can skate a 3,000-m course in about 4 minutes. what is their average speed for this course. a. 12.5m/s b. 1.33m/s c. 13.3m/s d. 1.25m/s

What causes darkening of the skin as melanin production increases

Why are fossils not found in igneous rocks? igneous rocks are made from cooling of lava or magma. igneous rocks are found too deep underground. igneous rocks are too dark in color to contain fossils. igneous rocks are too dense to contain fossils.