Select the best example of homeostasis from the choices below.
- when muscle cells need more oxygen, heart rate increases to pump blood faster.
- when plants do not get enough water, their vacuoles shrink and plants wilt.
- technology can a person to breathe when they cannot get enough oxygen on their own.
- bacteria live inside the digestive organs of animals, often supplying them with essential nutrients.

(me out over the last several centuries, scientists have made the following broad observations while investigating several branches of the life sciences: -the fossil record shows that different types of organisms have existed at different times in earth's history. -many organisms have similar body structures that seem to be adapted to different ways of living in their environment. -organisms of different species often share similarities in stages of embryonic development. -many species share genetic similarities, and almost all organisms use the same basic building blocks to construct proteins. -often, the extent of two species' similarities can be predicted from their geographic closeness to each other. -a great deal of change has been observed among species that have experienced strong selective pressures through many generations. scientists have carefully considered and rigorously tested the observations listed above. when scientists offer a of these observations, they are making 1.) testable explanation, deductive explanation 2.) scientific interference, scientific law