Answer:
The correct answer is A!
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Answer:
Instead of a brain, echinoderms have a ring of nerves located around their mouth area that governs their nervous responses. This ring coordinates their motion, their eating, basically anything that requires nerve control.
Explanation:
 
        
             
        
        
        
Water can act as either a base or an acid. Water acts as an acid by donating a hydrogen ion when it reacts with a stronger base such as sodium hydroxide. Water may also act as a base when it accepts hydrogen ion when reacting with a strong acid such as hydrochloric acid. This is based on Bronsted concept and definition of a base ( proton acceptor) and acid (proton donor). Such a  compound that can act as a base and as an acid is called an amphiprotic molecule.
        
             
        
        
        
Answer: Examples of prokaryotes are bacteria and archaea.
Explanation: