Which of the following pairs of characteristics would be best to begin using when creating a dichotomous key for a fish, a lion, a wolf and frog? 1a. has eyes
b. has no eyes

1a. has a mouth
b. has no mouth

1a. has nostrils
b. has no nostrils

1a. has fur
b. has no fur

the answer would be

1a. has fur

b. has no fur

Explanation:

I took the test and got it correct

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.

air enters through the nose, moves through the nasal cavity, the pharynx, the larynx, enters the trachea, moves through the bronchi andbronchioles till the alveoli.