Answer:
75%
Explanation:
The real answer is 80% and 75% is closest so uhm yea
Answer: Methylene it is also the simplest carbene.
The activation of the suprachiasmatic nucleus is stimulated by the presence of the light waves. This activation leads to the release of the hormone serotonin. Serotonin promotes the wake cycle of the person along with his internal clock. However, when the light is absent, then the pineal gland, which is present at the top of the middle of the brain, secretes the hormone melatonin. The melatonin regulates the sleep cycle of the person.
Hence, the blanks can be filled with 'serotonin and melatonin' respectively.
Answer:
False.
Explanation:
Flatworms are unsegmented.
Answer:
For growing bacteria it is necessary water, a source of carbon and nitrogen, some inorganic salts.
Explanation:
There are plenty of kind of bacteria, even, all of them need water to dissolved their nutrients and to remove the wastes outside of the bacteria body. The source of carbon could be carbon dioxide for some bacteria that do not need a lot of it. In the other hand, there are other bacteria that are feed based on glucose, fructose or another carbohydrate.
Nitrogen sources normally come from air as gaseous element or some inorganic salts like nitrates.
Other bacteria need specific elements like phosphorous, sulfur, zinc, copper, etc.
Hope this info is useful.
