Do you remember what we have learnt?

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Across
  1. 5. the mean of the squared deviation of each item from the mean.
  2. 6. tendency of plants to grow near water.
  3. 7. a way to conseve natural environment.
  4. 8. an electrical element that creates a low resistance path in a circuit and allows the current to flow through.
Down
  1. 1. devised the binomial naming system.
  2. 2. is a scalar matrix in which each diagonal element are all one.
  3. 3. concerns with general economic factors.
  4. 4. the existence of neutron was discovered by.