Which of the following is a testable hypothesis? a. after careful analysis, it is concluded that parrots are prettier than crows. b. cougars are the best. c. common house spiders need to eat insects to live. d. slime molds might be important but they are gross and disgust.

C i think . Hope this helps

Answer;

C. Common house spiders need to eat insects to live.

Explanation;A hypothesis is a tentative prediction or explanation of the relationship between two or more variables.A testable hypothesis is a hypothesis that can be proved or disproved as a result of testing, data collection, or experience. A testable hypothesis must be a relational statement between two or more variable. It should include phrases such as "more than", "less than", "greater than", "different from", or "related to". It also must be justifiable that is consistent with an existing body of research findings.

The answer is c water is the solvent and salt is the solvent

Air enters through the nose (and sometimes the mouth), moves through the nasal cavity, the  pharynx, the  larynx, enters the  trachea, moves through the  bronchi  andbronchioles  till the alveoli.