<span>Periderm is a term used to refer as the multilayered system of tissues, which is usually made of cork or phellem. When plant's girth is increased due to its secondary growth, they replace epidermal tissues with periderm. Periderm constitutes phellem or cork cells whose walls are thick with a waxy substance called the suberin which protects the surface of the cells and waterproofs them. This secondary covering are formed on small woody plants from the phellogen, a meristematic cell layer which is responsible for the periderm's development.
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The correct answer is A. Provides body tissues with oxygen
Explanation:
The respiratory system includes different organs such as the lungs, diaphragm, trachea, etc. that allow organisms especially animals to exchange gases that are necessary to survive. This mainly occurs as oxygen is taken from air or water in the case of fish and other aquatic animals and this provides the body tissues with oxygen that is necessary for multiple processes and at the same time it takes out the carbon dioxide through exhalation. Considering this, it can be concluded the respiratory system provides body tissues with oxygen.
Answer:
2
Explanation:
According to this question, the product (multiplication) of 10 and a certain number is 20.
Let x represent the number
Hence,
20 = 10 × x
20 = 10x (divide both sides by 10)
x = 20/10
x = 2
Answer:
He could make a macromolecule which is made up of carbon and hydrogen only.
Explanation:
An atom a fundamental piece of matter that constitutes a chemical element.
A molecule is a group of atoms bonded together. It represents the smallest fundamental unit of a chemical compound that can participate in a chemical reaction.
The red balls denote the hydrogen and black balls denote the carbon. He could make a macromolecule which is made up of carbon and hydrogen only.
