Answer:
The change in color in the flowers is because the plant has absorbed the dyed water. After some hours, we can see that the water has ascended through the roots, the stem and reached the flower petals. We can see the water's path till it evaporates in a process called transpiration, which returns water to the atmosphere.
Explanation:
Plants absorb water and other nutrients so that they can live. When we add ink into the water, we can see the water's path from the roots, up the stem, the leaves, and the flowers. In the flowers, the water evaporates through the stomata. We call this process transpiration. The ink allows us to see that the water was in the petals, but it evaporates, leaving behind the ink. As water evaporates, the plant drinks more, which results in a more intense color in the petals.
The oxygenated blood then leaves the lungs through pulmonary veins, which return it to the left heart, completing the pulmonary cycle. This blood then enters the left atrium, which pumps it through the mitral valve into the left ventricle. From the left ventricle, the blood passes through the aortic valve to the aorta.
Answer:
Change in the species structure of an ecological community over time. (A)
Explanation: Google
Answer:
Food web
Explanation:
In an ecosystem, the series of organisms that are connected to each other by energy and nutrient flow is called the food chain. One organism in a food chain derives the nutrition and energy from the preceding organism of the chain. However, most of the linear food chains are interconnected to form food webs.
Food webs are interconnected food chains that occur in nature since organisms derive their nutrition from multiple sources. For example, a grasshopper can feed on grasses and grain both. A bird can derive its nutrition from a grasshopper or grain. Likewise, an owl can feed on mice or grasshoppers. These multiple feeding relationships lead to the existence of food webs.
Frequency theory of hearing
According to the frequency theory of hearing the auditory nerve's impulse corresponds to the frequency of a tone. This allows the recognition of pitch. Sounds are detected in the ear as acoustic signal in the external and middler ear. It is later on transformed in an electrical impulse that a nerve can detect in the cochlea. The theory assumes that a nerve can fire at rates of 20 to 20000 times per second. This is the assumption that the frequency of human hearing range is at 20 to 20000.
