Which stage of sleep do nightmares occur?

Psychology is considered to be a science.

The ribosome structure contains RNA.

Placing a cell into a(n) __________ solution is best for keeping cells alive and healthy.

The formation of a peptide bond, joining two amino acids is:

Connective tissues share a developmental origin (all are derived from the mesenchyme of the embryo). 

Adenosine triphosphate (ATP) contains a sugar in its structure.

These are both:

This structure propels fluids/mucus:

Epithelial tissues are innervated.