Whales play an important role in stabilizing the aquatic food chain and reproduction of other species. 
As more whales are killed the food distribution in the ocean becomes destabilized and causes changes in the food supply of many other kinds of marine life.
Whales are vital to the food chain, stabilising food flow and maintaining a healthy ocean. 
As such, the rapidly decreasing whale population will have major effects on the ocean's ecosystem. 
 Believe it or not, whale poop also serves quite an important purpose to the ecosystem.
 
        
             
        
        
        
Answer:
The correct answer is - roundworms.
Explanation:
The answer is already mention in the question, however, the detailed answer is as follows:
The characteristics that are given in the question are true tissues, bilateral symmetry, and a pseudocoelom. Worms or helminths are known as primitive form of organization of the Bilaterians. All three group of worms or helmints have a basic bilateral symmetry. 
These organisms inaugurated various characteristic that are found and carried by other animals such as  true tissues, bilateral symmetry, and a pseudocoelom.
Thus, the correct answer is - roundworms.
 
        
             
        
        
        
Escherichia coli (E. coli) bacteria normally live in the intestines of people and animals. Most E. coli are harmless and actually are an important part of a healthy human intestinal tract.
 
        
                    
             
        
        
        
<h3>Meat consumption and environment</h3>
Explanation:
Increase in population rises protein demand. Many people meet their dietary protein requirements mainly from animal sources by consumption of meat and meat products like meat, eggs, and processed meat products.
Increased meat consumption leads to increase in global warming. Increased meat consumption raises the demand for meat and animal farming like cattle, poultry and fish farming. 
Farm animals release methane through their waste into the environment. Methane is one of the most potential greenhouse gases that cause global warming.  
Animal farming practices requires a lot of water and hence depletes natural water sources. Moreover, the effluent drainage from farmlands pollutes the land as well as natural ground water sources with methane and other pollutants including pathogens and renders the natural sources unusable.
Further, farm animals like cows and goats grazes farmlands and destroys the green cover which helps in carbon sequestration.  
 
        
        
        
Answer:
The sun's visible wavelengths of radiation pass easily through the atmosphere and reach Earth. Approximately 51% of this sunlight is absorbed at Earth's surface by the land, water, and vegetation. Some of this energy is emitted back from the Earth's surface in the form of infrared radiation
Explanation: