The spinal cord is made up of bundles of nerve fibers.
Answer:
<em>The correct option is A) an increase in oxygen levels, which led to the extinction of many anaerobic organisms.</em>
Explanation:
Photosynthesis can be described as a process in which food (glucose) is produced by photosynthetic organisms by using carbon dioxide, water along with light energy from the sun. Oxygen is released as a by-product of this reaction. The process of photosynthesis initially allowed for oxygen gas to get accumulated in the air. This caused the rise of aerobic organisms who required oxygen for respiration. Before the photosynthesis organisms evolved, there was not enough oxygen gas on earth to support the life of aerobic organisms.
Answer:
Plants require nitrogen to live, so plants in general depend on the nitrogen cycle and are a part of it. Explanation: Plants require nitrogen to live
Explanation:
Answer:
How respiratory system works?
What are the components of respiratory system?
Explanation:
Our lungs expand when we breathe in through our nose and mouth. That air moves down our trachea, through your bronchi and into the bronchioles, where it enters your alveoli where blood capillaries are passes which load oxygen and unload carbondioxide gas which can be removed from our body through exhalation. Nose, mouth, throat (pharynx), voice box (larynx)
, windpipe (trachea)
, large airways (bronchi) and lungs are the main components of our respiratory system.
Answer:
option A is the correct answer
Explanation:
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