Quick on the draw!

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

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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