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Insects reproduce at a faster rate than beef animals. A female cricket can lay from 1,200 to 1,500 eggs in three to four weeks, while for beef the ratio is four breeding animals for each market animal produced. This gives house crickets a true food conversion efficiency almost 20 times higher than beef. [28]
In both aerobic and anaerobic systems the growing and reproducing microorganisms within them require a source of elemental oxygen to survive. [1] In an anaerobic system there is an absence of gaseous oxygen. In an anaerobic digester, gaseous oxygen is prevented from entering the system through physical containment in sealed tanks.
Carnivorous plants can survive without food. Catching insects, however, supports their growth. [120] Poinsettias are not highly toxic to humans or cats. While it is true that they are mildly irritating to the skin or stomach, [121] and may sometimes cause diarrhea and vomiting if eaten, they rarely cause serious medical problems.
Herbivores form an important link in the food chain because they consume plants to digest the carbohydrates photosynthetically produced by a plant. Carnivores in turn consume herbivores for the same reason, while omnivores can obtain their nutrients from either plants or animals. Due to a herbivore's ability to survive solely on tough and ...
Specializing occurs when the digestive tract or alimentary canal has a separate mouth and anus so that transport of food is one-way. The most primitive digestive tract is seen in nematodes (phylum Nematode), where it is simply a tubular gut lined by an epithelial membrane. Earthworms (phylum Annelids) have a digestive tract specialized in ...
High-altitude adaptation in humans is an instance of evolutionary modification in certain human populations, including those of Tibet in Asia, the Andes of the Americas, and Ethiopia in Africa, who have acquired the ability to survive at altitudes above 2,500 meters (8,200 ft). [1]
The evolution of the human diet has not stopped since the end of the Paleolithic. Major functional adaptations have arisen in the last few thousand years as human technology has altered the environment. The most prevalent dietary adaptation since the Neolithic is lactase persistence, an adaptation that allows humans to digest milk. This ...
There is a rapid cold hardening capacity found within certain insects that suggests not all insects can survive a long period of overwintering. Non-diapausing insects can sustain brief temperature shocks but often have a limit to what they can handle before the body can no longer produce enough cryoprotective components. The common fruit fly