B3 Life on Earth

A summary of the key words for revision of 21st Century Science - Core B3 Life on Earth.
What H is a chemical messenger?. What D is man who had a theory of Natural Selection?. What L is the man who thought characteristics could be acquired?. What H is a human-like organism?. What SB is humans choosing the characteristics they want? . What FC is show how energy is passed from one animal to another?. What S is a change in the environment an organism responds to?. What SC respond to stimuli?. What B coordinates a response to a stimulus?. What CNS is made of the brain and spinal cord?. What G secretes hormones?. What F provides evidence for evolution?. What E is a gradual change over time?. What H are organisms that evolved 120 000 years ago?. What TTFH is how many millions of years for the earliest signs of life?. What A is from what organisms descend?. What C is a group of species living in a habitat?. What GF eats a range of different foods?. What ME is an event when many species died out at the same time?. What E means at risk of becoming extinct?.

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