Answer:
The correct answer is "The ammonia is controlled with a filter that uses two type of bacteria."
Explanation:
- The Biosphere on earth is composed of all the ecosystems, while each ecosystem is composed of the abiotic and biotic components and their mutual interactions. Aquarium is an example of aquatic ecosystem.
- Abiotic components constitute the non-living part of the ecosystem.
- Biotic components constitute the living part of the ecosystem.
- In the aquarium,
- The abiotic components include the air, water, heat, minerals, sunlight, fluorescent light.
- The biotic components include the aquatic plants, aquatic animals and the bacteria (in the filter attached to the aquarium).
- These bacteria are responsible for fixing dissolved nitrogen gas present in the water of the aquarium to ammonium and are called nitrogen-fixing bacteria.
- Free living bacteria like cyanobacteria or blue-green algae are examples of nitrogen-fixing bacteria.
- Fixation of dissolved nitrogen gas to ammonium and then conversion of ammonium to nitrites and nitrates (done by other bacteria) is essential because plants (terrestrial or aquatic) can use only nitrates as the source of nitrogen for the purpose of metabolism.
SA citizens vaccinated against yellow fever is yes because now we have different vaccinations in each other and created new medicine for the human being.
Non perishable food is the answer to this
Answer:
Yes, it actually is!
Explanation:
Your backyard is a great example of an ecosystem. You may have a lawn, which sprouts mushrooms, is home to squirrels and birds, and other forms of life.
<h2>Cannon -Bard theory</h2>
Explanation:
- Alone in the woods, Pedro hears a noise. He thinks he sees a bear coming toward him. His heart starts pounding and then, a moment later, he realizes how frightened he is. This sequence of events is BEST explained by the <u>Cannon-Bard t</u>heory of emotion.
According to Cannon-Bard theory, all the emotional expressions occur due to the stimulation of hypothalamic structures present in brain. This theory also states that feeling and physiological effects of an emotional stimuli occurs simultaneously.
Here, James thinks that a bear is coming, this is a stimulus. His heart starts pounding that is the physiological effect of the stimulus and the next moment he feels frightened which is a feeling.
So we conclude that in this case, the physiological effect and feeling of emotion occurred simultaneously. So these sequence of events is best explained by Cannon-Bard's theory.
