Define: Acid rain

Define: Acquired Characteristic

Define: Adaptation

Define: Addicted

Define: Algae (Singluar - Alga)

Define: Alkali

Define: Alkane

Define: Alkene

Define: Allele

Define: Alloy

Define: Alloy steel

Alpha Particles

Define: Alternating Current

Define: Amphibians

Define: Amplitude

Define: Antacid

Define: Antibacterial

Define: Antibiotic

Define: Antifungal

Define: Antiseptic

Define: Aqueous Solution

Define: Atmosphere

Define: Atom

Define: Autotrophic feeding

Define: Auxin

Define: Axon

Define: Bacteria (Singular - Bacterium)

Define: Bacterium (Plural - Bacteria)

Define: Balanced Equation

Define: Base

Define: Beta particles

Define: Big bang theory

Define: Binomial system

Define: Biodegradable

Define: Biodiesel

Define: Biodiversity

Define: Biofuel

Define: Biogas

Define: Biomass

Define: Birds

Define: Bitumen

Define: Black hole

Define: Blackspot fungus

Define: Blood glucose regulation

Define: Blood worm

Define: Body mass index (BMI)

Define: Boiling point

Define: Bonds

Define: Bromine test

Define: Bromine water

Define: Carats

Define: Carbon brushes

Define: Carbon cycle

Define: Carbon monoxide

Define: Carbon neutral

Define: Carcinogen

Define: Cataracts

Define: Cell membrane

Define: Cell wall

Define: Cement

Define: Central nervous system (CNS)

Define: Chalk

Define: Characteristics

Define: Chemical defence

Define: Chemical formula

Define: Chemical potential energy

Define: Chemosynthetic bacteria

Define: Chloroplast

Define: Chordata

Define: Chromosome

Define: Cirrhosis

Define: Classification

Define: Cleaner fish

Define: Climate change

Define: Clinically obese

Define: CNS

Define: Combustion

Define: Competition

Define: Complete Combustion

Define: Compound

Define: Concentration

Define: Concrete

Define: Conductor (Electrical)