Enumerate two features of the following phyla/division : a Mamalia.

The image shows embryos of three vertebrate classes

In what for do plants utilize nitrogen? why do they need nitrogen?

Which of the following shows the correct order in which light information travels through the eye? (2 points) lens, pupil, retina, optic nerve pupil, lens, retina, optic nerve pupil, lens, optic nerve, retina lens, pupil, optic nerve, retina