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.

The scheme below is from a series of reactions that are part of a synthesis of vitamin a. answer the following questions with reference to this scheme. (i) what is "reagent a"? (ii) draw a step-by-step mechanism which explains the formation of compound c from compound b (iii) which reagents would you use to form compound e from compounds c and d (reagents b and c)? for each reagent suggested above in (ii) explain the role of the reagent in the reaction to (iv) form compound e. you may wish to do this by drawing a mechanism. 1. addition of reagent a но reagent a 2. н,о" thо oh нон-с compound a. compound b. compound c .ch-оh 1. reagent b "сно 2. reagent c сh oh compound e. compound d.

Which element has the lowest electronegativity? calcium(ca) gallium(ga) selenium(se) bromine(br)

What is the indicator of the number of ions in solution? the amount of conductivity the amount of precipitate the amount of solute added