1. what kind of variation is eye colour?
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Other questions in this quiz
2. what are the two most sensitive parts of the body?
- forehead and lip
- back of neck and forearm
- fingertip and lip
- fingertip and forehead
3. how do the electrical impulses cross a synapse
- they don't
- make a chain
- they don't need to cross synapses.
4. what part of a nerve cell insulates nd speeds up nerve impulses
- myelin sheath
5. how many animal kingdoms are there?