16. Trachea is not a part of the circulatory system
18. Milk is pasteurized in order to decrease the number of microorganisms
19. The statement “Sexual reproduction leads to the possibility of variation in the next generation” is true
20. Infectious diseases are caused by microscopic organisms that can be transmitted from one organism to another
21. The number 23 represents chromosomes
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English Version : Topic about the axis of rare, bigeye
<u>Answer:</u>
An example situation of artificial selection is "More African elephants today naturally lack tusks compared to the elephant populations 100 years ago, because big game hunters sought elephants for ivory".
<u>Explanation:</u>
- The process of breeding animals to acquire the desired characteristics by the external means other than natural selection and behavior of animal itself is called as artificial selection.
- The first artificial selection was carried out by Darwin when he mated penguins that would have a higher chance of breeding.
- The practice of artificial selection was existing in human civilization a long time ago.
- This process was used to use wild animals and domestic animals in battles and other household works.
<span>Nevadan, Sevier, Laramide. </span>
Answer: Nuclear membrane
Explanation:
The extracellular matrix can be defined as the matrix that lies outside the cell. It includes all membranes or external coverings and fluid which separates the cell from its exterior. The extracellular matrix is important for adhesion, and communication between cell to cell. This helps the cell to connect with the other substratum. The cell wall is the external layer around the plant cell which separates the plant cell from its external environment. It maintains the structure of the plant cell. The cuticle is the thick layer of cells which separates the cells from the external environment. The basement membrane is sheet of cells that forms the part of extracellular matrix in the epidermis. The nuclear membrane is the part of the cell. It lies around the nucleus which is the component of the cell and not of extracellular matrix.