Flip and pair: figure with what it counts

Exercise and reference answers

Matching pairs

1. A

   3.8 billion years

   B

   since life originated

2. A

   1.5 million

   B

   species recorded so far

3. A

   6 million

   B

   species possibly on earth

4. A

   70 per cent

   B

   of named species that are animals

Explanation