b. to build bones
c. to make shells
d. to help organisms decompose
Answer:
To make shells (Ans. C)
Explanation:
Carbon dioxide from the atmosphere dissolves in the water present in the ocean. Organisms in the ocean use carbon to make calcium carbonate, which is building material of shells of organisms. Organisms that use calcium carbonate for protection and structure are known as calcifying organisms.
Explanation:
An element is defined as a substance that consists of same number of atoms with same atomic number.
An element by any chemical means cannot be broken down into its simpler molecules or substances.
Atomic number means the number of protons present in an atom.
Therefore, every atom of the element carbon has 6 protons.
The correct answer is the stage after a red giant finishes nuclear fusion
A white dwarf can be defined as a star that has completed its nuclear fusion. This is a type of star which is at the stage of completion of its nuclear burning , it expels its outer material which creates a planetary nebula. The core of star becomes hot and white in color. It takes millions of year for its cooling.
In thanks to the cell wall, the appearance of a plant cell does not change when water is plentiful and is therefore normal.
A cell wall is a structure on the outskirts of most plantcells. The density of the wall can change from time to time, but this wall is often rigid. This cell wall functions to provide the cell with protection and structural support, as well as help it withstand mechanical pressures.
The cell wall helps the cell in withstanding a form of mechanical pressure known as turgor pressure exerted by the vacuole when the plant absorbs a great amount of water. In this way, the cell wall helps in withstanding water pressures in hypotonic solutions. In addition, it also prevents the shrinkage of the cell in hypertonic solutions from exceeding a certain limit.
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B. contains enzymes that begin the breakdown of proteins
C. moistens food and aids in compacting of the bolus
D. dissolves food chemicals so they can be tasted
Saliva cleanses the mouth, moistens and compacts food, and dissolves food chemicals for taste.
Saliva is a clear liquid that is produced by the salivary glands in the mouth. It serves several important functions in the digestive process. It keeps the mouth clean by cleansing it and helps to remove food particles. Saliva moistens food and aids in the compacting of the food into a bolus, which can be easily swallowed. Additionally, saliva contains enzymes such as amylase that begin the breakdown of carbohydrates, not proteins. Lastly, saliva dissolves food chemicals so they can be tasted.
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