Complex organisms with gills and lungs were major life forms that existed in the. a.
Mesozoic era
c.
Precambrian era
b.
Cenozoic era
d.
Paleozoic era

D which is Paleozoic era

Explanation:

Paleozoic era

D. Paleozoic Era

Explanation:

recent brain research has shown some surprising benefits as a result of formal musical training. learning to play a musical instrument appears to develop parts of the brain that can even influence academic results. the studies indicate that the earlier a child begins training, the more benefits there are. one such study showed that children who began musical studies before the age of seven had a more developed brain in the region where language production and auditory processing take place. scientists believe there is mounting evidence to show that early musical training can improve brain function.

explanation:

the central idea is basically saying that juveniles that have committed a crime will not have the same consequences as the   adults that have. they will have a softer punishment than what the adults have that is harsh in some ways.