Nutrients from fertilizers, such as nitrogen and phosphorus, can be harmful to aquatic ecosystems primarily because they promote excessive growth of algae and aquatic plants. Hence option b "The increase in algae population reduces oxygen in the water" is correct.
This excessive growth is known as eutrophication. The process unfolds as follows:
Nutrient Input: Fertilizers with nitrogen and phosphorus are often utilized in residential and agricultural settings. These nutrients may be introduced into surrounding water bodies by runoff from these locations.
Algal Blooms: Nutrients function as fertilisers for algae and aquatic plants, causing algal blooms. Algal blooms are therefore created as a result of the fast growth in the population of algae. These blooms can completely cover the water's surface, turning it green or murky.
Oxygen Depletion: The process of decomposition consumes oxygen when the algae and aquatic plants die and degrade. An higher need for oxygen results from the large amount of organic material from the deceased organisms. As a result, the amount of dissolved oxygen in the water may decrease.
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2.Cloudiness of the eyes
3. Livor mortis
4. Algor mortis
Answer : Option 1) Rigor mortis.
Explanation : The parameter of rigor mortis reaches a maximum at 12 hours and is found to be gone within 36 to 48 hours.
Rigor mortis where rigor means stiffness and mortis means of death or in simple words it is postmortem rigidity, the third stage of death, is one of the major recognizable signs of death, which is mainly caused by chemical changes in the muscles post mortem, and it causes the limbs of the corpse to stiffen.
In humans, rigor mortis can occur as soon as 4 hours post mortem.