Answer:
The correct answer will be option-D
Explanation:
A Facet joint is a synovial joint present between the inferior articular process of one vertebra to the superior articular process of another vertebra.
The facet joints form articular pillars which provide the structural stability and can have different orientation depending on the plane or angle they form.
1. When the articulating facets lie parallel to the frontal plane and form 45° angle to the transverse plane then it allows all the movements in the cervical spine.
2. When the articulating facets 20° to the frontal plane and 60° to the transverse plane then it allows the lateral flexion and rotation in the thoracic spine region.
3. When the articulating facets form 45° to the frontal plane and they are at right angles to the transverse plane then it allows only flexion and extension in the lumbar region.
Thus, option-D is the correct answer.
This is called a joint. A place where two bones meet or come together is called a joint. The two bones are separated by cartilage to keep them from rubbing together.
Answer:
a substituted derivative of purine, especially the bases adenine and guanine present in DNA.
a colorless crystalline compound with basic properties, forming uric acid on oxidation.
Answer:There is a fundamental difference in the way energy and matter flows through an ecosystem.Matter flows through the ecosystem in the form of the non-living nutrients essential to living organisms. When a living organism dies, nutrients are released back into the soil. These nutrients then are absorbed by plants, which are eaten by the herbivores. Matter, once again, is passed on. The herbivore is eaten by a carnivore (and matter is yet again transferred therein). Ultimately, when the carnivore dies, matter is returned back to the soil by the decomposers and the cycle repeats. So you see, matter is recycled in the ecosystem.Unlike matter, energy is not recycled through the system. A part of the energy is lost at each stage.
Explanation:
For centuries scientists thought the Universe always existed in a largely unchanged form, run like clockwork thanks to the laws of physics. But a Belgian priest and scientist called George Lemaitre put forward another idea. In 1927, he proposed that the Universe began as a large, pregnant and primeval atom, exploding and sending out the smaller atoms that we see today.
His idea went largely unnoticed. But in 1929 astronomer Edwin Hubble discovered that the Universe isn’t static but is in fact expanding. If so, some scientists reasoned that if you rewound the Universe's life then at some point it should have existed as a tiny, dense point. Critics dismissed this: the celebrated astronomer Fred Hoyle sarcastically called this concept the “Big Bang Theory"
