This jellyfish is one of earth's simplest animals. it has no head really, no one-way digestion, no arms or legs. it does have stinging cells. how would stinging cells this simple animal survive? a) stinging cells scare away large predators. b) the stinging cells take the place of appendages. c) the stinging cells paralyze prey that the jellyfish needs for food. d) stinging cells can the jellyfish move quickly through the water to escape predators.

Suggest which functional groups are responsible for the reactions with(i) sodium,(ii) bromine water(iii) alkaline aqueous iodine.(3 marks)(iv) suggest structures for x and y.(1 mark)(b) one molecule that has been found in the dust clouds is hydroxyethanal: hoch2cho. name the two functional groups present in this compound.(2 marks)(c) but-1-ene, ch3ch2ch=ch2, is an important compound in the petrochemical industry. some reactions of but-l-ene are given below. in each empty box, draw the structural formulaand write the name of the organic compounds formed.