Teens who engage in fights today are more at risk than teens who fought 20 years ago because their opponents are more likely to: a) be stronger and meaner b) carry weapons c) be better trained in gang fighting d) all of the above

Explain why some cells in a females body respond to reproductive hormones while other cells do not.

1infants internalize what they take in through their senses and                a.  show no signs of remembering it.      b.  vocalize it.      c.  display it in physical movements.      d.  forget it immediately.2 early experiences have a impact on the architecture of the brain.                a.  decisive      b.  mild      c.  minimal      d.  moderate  3which of the following is an infant's main learning tool in the first months after birth?                 a.  mouth      b.  music      c.  book exposure      d.  hands

Results from damage to tiny air sacs in the lungs