Your answer will be c) when there was no life on Earth
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Answer:
During the development of the fetus, the mechanism by which the mammalian skeletal system gives rise to tissues of the bone is termed as endochondral ossification. Endochondral ossification also plays an essential role at the time of the development of the long bones length, rudimentary generation of the long bones, and healing of bone fractures naturally.
The following are the steps in the process of endochondral ossification:
f. The development of the cartilage model.
b. The calcification of cartilage takes place and the formation of bone collar occurs.
a. In the diaphysis, the formation of the ossification center takes place.
c. In the epiphysis, the formation of ossification centers takes place.
d. Replacement of cartilage takes place by the bone.
e. Ossification of epiphyseal plates takes place.
Three reason for a species to become extinct are:
Climate Change: Each kind has their own defense systems and built in mechanism to fight epidemics and diseases, with the changing climate for some species it becomes hard to fight with the new epidemics and diseases causing their eventual extinction.
<span>Spread of Invasive Species: When in an area a species is utilizing the resources and another invading species also start making use o that source the battle will end on the rule or "survival of the fittest" and one from the two will become extinct.
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<span>A catastrophic event / Natural disaster: At times there can be a single catastrophic event like a volcanic eruption or a meteor striking the earth etc. can cause an entire species to go extinct.</span>
Lipids are not polymers because they contain one molecule and are not macromolecules.