Answer:
the geosphere, atmosphere, hydrosphere and biosphere.
Four spheres are all independent parts of a system. The spheres interact with each other, and a change in one area can cause a change in another. Plants (biosphere) draw water (hydrosphere) and nutrients from the soil and release water vapor into the atmosphere. The biosphere contains all the planet's living things.
Explanation:
hope this helps 8D
Reflex = cerebellum
Muscles = cerebellum
Balance = cerebellum
Answer:
C) Three hydrogen bonds will form with guanine.
Explanation:
Generally the DNA molecule is made up of Purines bases of Adenine and Guanine,and Pyrimidine of Cytosine and Guanine.However,RNA contains a different pyrimidine of Uracil.Thus the pairing is A-U am C-G.The uracil replaces Thymine.
The structure above is a Pyrimidine,because it is made up of single ring structure(an heterocylclic aromatic structure) compare to double structure of purines. Heterocyclic means it is ring form.Aromatic means it has resonance bonds which shift with the rings for stability.
It is also contains of two substitutes at position 4 of the ring structure (amineNH2) and at 2 which is the Keto group(=0).Therefore the structure is Cytosine.
In RNA structure the Cytosine pair with the three hydrogen bonds with guanine,while Adenine pair with Uracil.This ensures stability of the RNA structure.
An involuntarily muscle contracts when you don't mean to do it, or you do it without thinking. One body function is the lungs contracting so you can breathe. you don't think about it it just happens. Hope this helped.