In the refrigeration cycle, heat is exchanged through the expansion and condensation of gases.
a. true
b. false

Astudent observes a star from two positions of earth in its orbit, in summer and winter, and measures the change in the position of the star. which of these can be best calculated by this method?

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.

Describe your dna model. which part do the straws represent? the pushpins? the paper clips and the black dots you made with the marker?