Answer:
the elements present in the star's atmosphere
Explanation:
The spectrum showing dark lines is an absorption spectrum. The dark lines actually indicated the energy absorbed by the elements present in the atmosphere of the star.
The elements absorb particular wavelengths and reach higher energy state. The absorbed wavelengths appear as dark lines in the spectrum.
b. algae
c. trees
d. photosynthetic bacteria
Chemosyntheticbacteria do not require sunlight for their survival. So the correct option is A.
Autotrophicorganisms like plants prepare their food by using sunlight as a source of energy which is converted to chemical energy. But some bacteria, that live deep below the surface of the ocean use chemicalenergy to prepare this food.
This process is known as chemosynthesis as it uses chemical energy instead of light energy. It uses carbon in the form of carbon dioxide or methane and some inorganic nutrients which are converted into organic matter.
In this process, the inorganicmatter is oxidized to produce energy. In a specific mind of chemosynthesis called hydrogen sulfide chemosynthesis, carbon dioxide and oxygen are used to produce CH₂O, a carbohydrate.
Following is the reaction
CO₂ + O₂ + 4H₋S → CH₂O + 4S + 3H₂O
The organisms that perform chemosynthesis are called chemoautotrophs.
Therefore the correct option is A.
Read more about chemosynthesis, here
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Answer and Explanation:
The human being has a bone system made up of 206 bones that grow and develop in childhood and adolescence. Thanks to these bones, people can stand up and move around. The function of the bone system is to support the body, allow locomotion, and protect the organs. The bones that make up the system are linked through joints and are made up of a class of cells known as osteocytes.
The bones form various cavities that protect the internal organs from possible trauma. For example, the skull protects the brain from hits, and the rib cage, made up of ribs and sternum, protects the lungs and heart. On the other hand, various minerals such as calcium and phosphorus are stored in the bones, not only to provide them with hardness, but to later use them as an input in muscle contraction and other organic processes
It's a) limited access to nutrients