<span>The correct answer is D: All of the above. Any small individual changes in the eco-system can cause larger scale changes throughout the eco system due to the interconnectivity of species within the larger system.</span>
An ecosystem is a community of living organisms which interact among themselves and with their non-living physical environment to sustain their lives. An ecosystem typically consists of abiotic (non-living) and biotic (living) components which are linked together for the energy flow and nutrient cycling.
The changes in an ecosystem will occur if the non-living and living components of the ecosystem change this will bring instability to the ecosystem. For example, water body like river a non-living factor if get dried it will affect the life cycle of the aquatic animals. Therefore, this will bring instability to the ecosystem.
On the basis of the above explanation, d. all of the above is the correct option.
During exercise there is an increase in physical activity and muscle cells respire more than they do when the body is at rest. The heart rate increases during exercise. The rate and depth of breathing increases - this makes sure that more oxygen is absorbed into the blood, and more carbon dioxide is removed from it.
<span>Amylase needs an optimum pH for its activity. It is in the range of 6-7. Below or above pH will denature this enzyme. The pH level is optimum for this enzyme in the mouth and hence it catalyses the break down of sugar. The pH level of stomach is lower than its optimum level duet to the activity of gastric acid. Hence the enzyme becomes inactive in the stomach.</span>
The pair of characteristics that one must use to classify a fish is the presence of jaw and skeleton type. Agnatha fishes are also called jawless fishes and they lack bony skeletons. Cartilaginous fishes are composed of cartilage skeletons. Bony fishes have bony skeleton structures.
