Given that ABC ~ ADEF, solve for x.

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.

i think its both a and b

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.

answer; coat color for blending in with dry grass;