Answer:
The Earth might seem like it has abundant water, but in fact less than 1 percent is available for human use. The rest is either salt water found in oceans, fresh water frozen in the polar ice caps, or too inaccessible for practical usage. While population and demand on freshwater resources are increasing, supply will always remain constant. And although it's true that the water cycle continuously returns water to Earth, it is not always returned to the same place, or in the same quantity and quality.
Option A. The suprachiasmatic nuclei are found in the <u>hypothalamus</u>
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What is the suprachiasmatic nucleus?
- The suprachiasmatic nucleus or nuclei (SCN) is a tiny region of the brain in the hypothalamus, situated directly above the optic chiasm.
- It is responsible for controlling circadian rhythms.
- The neuronal and hormonal activities it generates regulate many different body functions in a 24-hour cycle.
- The mouse SCN contains approximately 20,000 neurons.
- The SCN interacts with many other regions of the brain.
What is hypothalamus?
- The hypothalamus is a small but important area in the center of the brain.
- It plays an important role in hormone production .
- It helps to stimulate many important processes in the body and is located in the brain, between the pituitary gland and thalamus.
To know more about hypothalamus, refer:
brainly.com/question/11352172
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Answer: The total mass of plants combined is way more then the mass of animals. Animals cannot make their own food so they must eat plants and/or other animals.
The animals dont get what they need so the oxygen does not get fed
