1) What do we call the differences between organisms? a) Differences b) Similarities c) Variation d) Diffariation 2) Which of the following is one of the causes of variation? a) Environment b) Gender c) Skin colour d) A Scar 3) Which of the following differences is caused by a person’s genes only? a) Skin colour b) Weight c) Eye colour d) A scar 4) Which of the following could be caused by a person’s genes and their environment? a) Skin colour b) Eye colour c) Natural hair colour d) A scar 5) What do invertebrates not have? a) A shell b) A spine c) Skin d) Lungs

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