Which of the following statements about biodegradable polymers is true?
A) They will degrade quickly in a landfill.
B) Thermosetting polymers are biodegradable, but thermoplastics are not.
C) They often require specific temperatures or the presence of microorganisms in order to undergo degradation.
D) Polyvinyl chloride is a biodegradable polymer.
Question 2
The fact that a heat pump requires energy to move heat from a colder object (the outside of a house) to a hotter object (the inside of the house) is a real life observation of which thermodynamic law?
A) the first law
B) the second law
C) the third law
D) the fourth law
True-color view of Mars seen through NASA's Hubble Space Telescope in 1999
True-color image of layers of haze in Titan's atmosphere.
true story
True Friendship
Midsagittal section indicating locations of true and false pelves