Science- Moving and Growing
作者：Angela Dobson
1. Invertebrates
1.1. no backbone
1.2. bugs
1.3. soft
2. Exercise and rest
2.1. Changes
2.1.1. Heart beat increases
2.1.2. Breathe faster
2.1.3. heat up
2.2. Oxygen to muscles
3. Vertebrates
3.1. Internal skeleton
3.1.1. ribs
3.1.2. skull
3.1.3. vertebrae
3.1.4. pelvis
3.2. REASONS
3.2.1. movement
3.2.1.1. Muscles
3.2.1.1.1. work in pairs
3.2.1.1.2. contract
3.2.1.1.3. relax
3.2.2. support
3.2.3. protection