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Complete the text with the comparative or superlative form of the adjectives in brackets and any other necessary words.

Physical changes in human appearance have occurred ever since we first appeared. However, 1. more recent (recent) changes have not been 2.  (dramatic) they were in the 3. (distant) past. This is because we have become 4. (much/good) at adapting the environment to suit us rather than evolving to fit in with the environment.

Some changes have been 5.  (global) whereas others have been 6. (regional) and localized. The 7 . (important) change affecting us is that the human body has become 8. (slightly/small). Humans are not 9. (tall or heavy) they used to be.

The 10. (tall) humans lived around 40,000 years ago, with an average height of 183 cm. This is 11. (much/tall) today's average height of 175 cm. Perhaps surprisingly, the human brain is also not 12. (big) it used to be. In fact, the human brain is now the 13. (small) it has been at any time in the past 100,000 years, and is about 14. (10%/small) when humans first appeared.