In artificial selection, nature provided the variation, and human selected those variations that they found useful
Answer:
Cellulose is the main substance found in plant cell walls and helps the plant to remain stiff and strong
Explanation:
The correct answer is: A. A watery mixture of partially digested food released by the stomach into the intestines
Chyme or chymus is formed in the stomach, during the process of digestion (it takes 40 minutes to 3 hours to be produced) , and it is transported to the small intestine-duodenum.
In the beginning of the digestion (in the mouth), mixture of food and saliva called bolus, is formed. Mechanical and chemical breakdown of a bolus creates chime which is ready for the extraction of nutrients from it.
Answer:
The process responsible for producing most of the Earth's oxygen is known as photosynthesis
Explanation:
In this process, plants and certain other organisms convert sunlight into oxygen and other products.
