This chart shows a portion of a dichotomous key. Dichotomous Key A dichotomous key is shown. 1 splits into 3. 3 splits into organism X and 9. 9 splits into 10 and organism Z. Which relationship can be determined from this dichotomous key? Organism X and organism Z have at least one observable trait in common. Organism Y has at least one observable trait in common with organisms X or Z. Organism X is in a different phylum than organism Y. Organism Z is genetically closer to organism X than to organism Y.

answer: accepted answer: aquatic animals use the oxygen dissolved in water to carry out respiration. since the amount of dissolved oxygen in water is low as compared to the amount of oxygen in the air, therefore the rate of breathing in aquatic animals is much faster than it is in terrestrial animals.

explanation:

c is the correct answer hope this !

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.