Quick on the draw!

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O R G K H J W H A K W E F M G S L U X R M
C P A N Q X G W T F V J O C W Q R N O J F
W V K B I O F U E L S F P D B O E P X L T
M T Y V X H T J X W C S E W T P P V Q D O
H K E Y J M J P F Q N R X S Y H F X B E V
O E W T I Q N L B D M A L G D Y E S S S L
P A H F C D J D Q G D U B Q E D O D L P U
K V R X U A H I W J X B N R J L X H V E Q
R X E R N L U A U A L A P D P V S X Y E M
U P T O T Y Y C B I O E T H A N O L B B P
Y L A Q W B K I L J F U H Y L G R L V G M
K B W U W N U M J L L N C S V M B X V R K
G B E A U G V V J R Q R E H E U N N J W H
T L T N I A G E G A U D J D B S F I H X X
F A C U O N Q F X K V L J M F C Y O B P K
E N B W B A X E B L I N R K D J H I E N J
E K H F G X G S S I T G B I T U W V Q R A
R E H R O D V I W A Q B V T L F R J R J V
E L E C T R O C H E M I C A L C E L L W F
U B P F L W D F A K L F M E J D O W C G A
M T D A T V E M V X R G D S J V S L N Y V

Clues

  • What is the only by-product of a hydrogen fuel cell? (5)
  • What name do we give to any fuels made from plants and animal waste? (8)
  • What type of biofuel is used mainly in Brazil and the USA? (10)
  • Which cell uses chemical reactions to produce electricity? (15, 4)

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