What is the most common method used to count a large species population? a. estimating b. sampling c. guessing d. a pencil and paper

Option B is the correct answer.

Sampling is done for estimating a population's size by taking one or more samples from the population. Then these samples are used to make assumptions about the population as a whole.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.