What is the purpose of the motor neuron?

Which of the following particles always has a positive charge? a. electronb. neutron c. proton d. ion

Creating new things to solve problems and improve life depends on the close interaction of which two fields?

Which of these internal feedback reactions does not need your brain? oa. your leg jumping when it is hit by a reflex hammer b. your deeper breathing when you need more oxygen c. your body temperature rising when you have an infection d. your heart beating faster when you are in danger