What is a prion? a type of cell

a type of virus

how a virus gets into a cell

an infectious protein particle with no DNA

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Apiece of copper has a temperature of 75.6 0c. when the metal is placed in 100.0 grams of water at 19.1 0c, the temperature rises by 5.5 0c. what is the mass of the metal?

Table sugar completely dissolved in water is an example of a?