Aa abiotic - autotroph
Bb backbone - bulb
Cc calcite - cytoplasm
Dd dam - dyne
Ee earthquake - extinct
Ff fabric - fusion
Gg galaxy - grime
Hh habitat - hypothermia
Ii Ice Age - irrigation
Jj jackal - Jupiter
Kk kaleidoscope - kwashiorkor
Ll laboratory - lustre
Mm Mach number - myopia
Nn naphthalene - nutrient
Oo odometer - ozone layer
Pp paleontology - pupa
Qq quadrant - quotient
Rr radar - rust
Ss saccharin - synthetic
Tt telescope - troposphere
Uu Ulna - urine
Vv vaccine - vulgar fraction
Ww warm blooded - wrist
Xx x-axis - xylem
Yy y-axis - yolk sac
Zz zephyr - zymase
