Before the 1700s, the white-footed mouse, permyscus leucopus, lived in
the rural woodlands that once covered the area now known as new york
city. as the city expanded, mouse populations have remained in these
urban areas. other mouse populations have also continued to live in the
rural areas around new york city. recent studies show that mice from
rural populations have longer teeth than mice from urban populations.
which statement best explains the observation that rural mouse
populations have longer teeth than urban mouse populations?
o urban mouse populations need much more food than rural mouse populations
food in rural areas requires more chewing, so mice with longer teeth are better
suited for rural areas.
o food in rural areas requires less chewing, so mice with longer teeth are better
suited for rural areas.
o urban mouse populations need much less food than rural mouse populations

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.

stimulus is a change in the environment that causes an organism to react. the response is the reaction to the stimulus. some examples of stimuli for zebras are drought, to many predators, and bad feeding grounds such as dead grass or plants. zebras respond to stimuli just like all other living organisms

the answer is true when observing or determining population size, a direct observation is use, in which each organism is counted in a population or in an area. one benefit of this measure is that you get the exact population count but it will take a long time to  determine  the  size  of a  population.

hi my name is ashlynn and im 15

these macromolecules could either be amino acids, proteins or nucleic acids. they are responsible for the chemical changes and reactions that affects largely the cell and its composition. take for instance the cytoplasm of the cell where these organelles are settled. these simple organelles are composed of macromolecules which ignites and catalyses different functions that enables cells, in macro-perspective in motion and metabolism. in intestines for example, metabolism happens and breaking down parts of a food to simpler compounds that are used and these nutrients delivered throughout the body and again broken down by into smaller components.