Answer:
D. Single-stranded
Explanation:
DNA normally has a <em>double-stranded </em>structure. Each strand is composed by nitrogenous bases, sugars and phospates; strongly binded together by chemical bonds. The strands are bonded to each other, however, by relatively <em>weak interactions </em>between the hydrogen atoms in the nitrogenous bases in each strand. The energy supplied by heat is enough to break the weak interactions between hydrogens, but not enough to break the strong chemical bonds that make up the strands.
Clavicle is also called as collar bone.These are the long bones which connects the arm to the case of the body.it keeps the arm to move freely.
therefore,
Clavicle is called as the beauty bone.
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What is a fossil?
Fossils are fossilised (petrified) remains of animals/plants. A fossil though, is only a fossil, when it is from a different geological era.
How does that relate to evolution?
Evolution and fossils are very related. When we scan the DNA of different fossils, we find that the DNA can be similar to living species we have today, which helps us trace back their origins.
Tracing back a species origins is not something we do just to see how that species changed along time. When we manage to make an evolutionary chart of a species, we know how they changed, what they changed, and maybe not more, but very importantly, when the previous species were extinguished. If we know when they were extinguished, we can find out what caused that extinction:
- A lack of adaptation.
- Lack of resources.
- Temperature changes.
- Increase of predators.
- Deadly migrations.
- Other natural disasters.
So, in other words, by studying one species, we can study our own planet.
Hope it helped,
BioTeacher101
Glucose is the main type of sugar in the blood and is the major source of energy for the body's cells
