Which situation would most likely increase the carrying capacity for humans
in a certain region?
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a. limited access to medicine
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b. a higher rate of disease
c. a new source of freshwater
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d. longer, colder winters

answer: b: experiments that showed that all cells are similar in how they metabolize and in their composition

explanation:

before, trains worked using the steam engine. thus, it uses heat so it is crucial to apply heat balance. the steam engine absorbs energy during the stage of boiling water. so, this is the endothermic reaction. when the steam is used to work the piston, it has to release this energy through running the train. the excess energy is released as an exhaust to the chimney. this is the exothermic process because it releases energy to the surroundings.

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.