Final answer:
In biology, plants in highlands must adapt to both high altitudes and low altitudes. Scientists can observe plants' responses to different altitudes to determine if they belong to the same species. Experiments can be conducted by growing plants at different altitudes and observing their adaptations.
Step-by-step explanation:
In biology, the concept of plants growing at different altitudes can be observed. In the case of highlands, plants must adapt to both high altitudes and low altitudes at the same time. This can be seen through the study of populations of plant species found at different altitudes in the mountains.
Scientists can investigate whether these populations have the same underlying genetic structure and belong to one species by observing the plants' responses to different altitudes. If the high-altitude plants respond to low altitude in the same way that low-altitude plants have, and vice versa, it indicates a similarity in genetic structure.
For example, scientists can conduct experiments where they grow high-altitude plants at low altitudes and low-altitude plants at high altitudes. By observing whether these plants start to resemble the plants typically found at these altitudes, scientists can determine if the plants can adapt to different altitudes.