Four friends were working together on a science fiction story. Their story took place on the moon. One of the students wrote a scene in which two of the characters were
looking up at the "crescent Earth" just as it was setting behind a mountain on the moon.
The students had different ideas about the scene. This is what they said:
Brett
I don't think you would see phases of the Earth. The Earth always lo
like a round blue ball from space. But I do think you would see the E
set.
Margot
I think we would see a "crescent Earth". It's just like being on Earth a
looking up at the moon. But the Earth would never set.
I agree that we would see a "crescent Earth". The "crescent Earth
set, but it would set very slowly
Scarlet
Hermione I don't think you would ever see a "crescent Earth" or ever see the E
rise or set.
Who do you think has the best idea about "Earth phases" and a rising and
setting Earth?

Biological polymers are large molecules composed of many similar smaller molecules linked together in a chain-like fashion. The individual smaller molecules are called monomers. When small organic molecules are joined together, they can form giant molecules or polymers. These giant molecules are also called macromolecules. Natural polymers are used to build tissue and other components in living organisms.

Generally speaking, all macromolecules are produced from a small set of about 50 monomers. Different macromolecules vary because of the arrangement of these monomers. By varying the sequence, an incredibly large variety of macromolecules can be produced. While polymers are responsible for the molecular "uniqueness" of an organism, the common monomers are nearly universal.

The variation in the form of macromolecules is largely responsible for molecular diversity. Much of the variation that occurs both within an organism and among organisms can ultimately be traced to differences in macromolecules. Macromolecules can vary from cell to cell in the same organism, as well as from one species to the next.

Explanation: