Josh performs an experiment to see how different brands of fertilizer will affect the growth of tomato plants. the amount of sun, amount of water, & type of soil is the same for every plant. the only thing he changes is the type of fertilizer used on each plant. the fertilizer is the variable. independent dependent constant hypothesis

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:

the answer

b.) bowling ball

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.