The silurian period occurred                a.  during the hadean eon.      b.  before the neogene period.      c.  during the mesozoic era.      d.  after the permian era.

We know that the Silurian period gave way to the Devonian period, which is when the Neogene era started, therefore:

The answer is B. before the Neogene era.

Hope it helped,

BioTeacher101

do you have a picture?

humans are now responsible for causing changes in the environment that hurt animals and plant species. we take up more space on earth for our homes and cities. we pollute habitats. human activity often changes or destroys the habitats that plants and animals need to survive.