Some of these muscles perform various muscle actions but what muscle action do they ALL perform?
- Finger flexion
Wrist extension
Wrist flexion
Radial deviation

Explain what causes the skin to burn in the sun? explain why people should avoid the sun if taking a photosensitive medication?

The nature–nurture issue refers to the debate over the relative contributions that make to the development of psychological traits. a. introspection and nerve cell activity b. unconscious and conscious motives c. behavior and mental processes d. genes and experience

If human development really does proceed continuously, what value does stage theories of development have?