Which of the following describes a chemical change ?

a. burning paper
b. freezing water
c. bending water
d. melting ice

Here's one way to follow the scientific method. place the missing steps in the correct position in the process.

Glycogen is an energy-storage molecule in humans. a hormone that is called insulin controls the storage of glycogen in the liver. insulin is made up of amino acids.

Dna and rna share a number of similarities,but they also differ in certain aspects of their structure. wich nitrogenous base is found in rna but is not found in dna