The hardest substance available on earth is a) Diamond b) Platinum c) Rocks

The ‘Pascal’ is a unit measurement of what? a) Pressure b) Weight c) Temperature

What is it called when light changes direction after leaving a lens? a) Reflection b) Refraction c) Diffraction

What set of terms correctly represents an increasing order of complexity and size in living things? a) atom, molecule, organelle, organism, cell b) molecule, cell, tissue, organ, organism c) organelle, tissue, cell, organ, individual

What connects bones to other bones? Select one: a) cartilage b) tendons c) ligaments

Which of these is the main way that ocean tides are created? a) The rotation of the Earth on its axis b) The gravitational pull of the moon c) The gravitational pull of the sun

What percentage of animal species are invertebrates? a) About 50% b) About 95% c) About 90%

What does nephrology study? a) The kidneys b) The liver c) The blood

What does a light-year measure? a) Brightness b) Time c) Distance

How many pairs of ribs does an adult human have? a) 10 b) 12 c) 8

What is the scientific term for peeling skin? a) Desquamation b) Dermatitis c) Exfoliation

The Austrian monk Gregor Mendel's observations of what organism formed the basis for the science of genetics? a) Pea plants b) Mice c) Fruit flies

Which of these isn't an essential aminoacid? a) Lysine b) Thryptophan c) Riboflavin