Answer:
arachnoid mater
Explanation:
CSF is gradually reabsorbed into the blood at the same rate at which it is formed to maintain the constant pressure. The arachnoid mater has finger-like extensions that project into the dural venous sinuses, especially the superior sagittal sinus. The projections of arachnoid mater are called arachnoid villi and a group of arachnoid villi is called an arachnoid granulation. Arachnoid villi are the structures through which cerebrospinal fluid is drained into the superior sagittal sinus and is reabsorbed into the bloodstream.
Cells have different uses and functions. There must be differentiation/diversity between cells to form a functional organism.
Answer:
The addition of an extra chromosome usually occurs spontaneously during conception. The cause of this is unknown and prevention is not possible. The most important risk factor for trisomy conditions is maternal age. Women in their late 30s and 40s have a higher chance of trisomy conditions occurring.
These are just quickly written down, but I hope these can serve as sufficient answers.
Plant Behaviours:
1. - Some plants know when the sun will rise. Sunflowers are a good example of exhibiting this behavior called "Circadian Rhythm."
2. - Plants that have vines search for a surface, preferably a pole but walls are acceptable, to climb and grow on, which is called "Twining."
3. - Some plants 'curl up' whenever they are touched.
4. - Corn seeds can distinguish between 'up' and 'down,' which is called "Gravitropism."
5. - A plant can distinguish their own roots from another plant's.
Animal Behaviours:
1. - Animals can communicate, actually, they can communicate quite well! Dolphins and bees are infamous for this, as they communicate through a series of actions and the point comes across clear to others in their species.
2. - Body language is a behavior most commonly associated with animals, even though we do it too.
3. - Territorial/'Defensive' behaviors are common, such as marking and hostility when another animal trespasses into their domain.
4. - Certain behaviors are exhibited to attract/court mates, such as birds singing songs or chemicals being thrown off to lure in a partner.
5. - Cooperation is also a very common behavior, as seen in ants.
6. - Annual cycles, such as migration and hibernation.
7. - Animals also have a circadian rhythm like plants, which aids in whether or not an animal exhibits the behavior of being nocturnal.