There legs had to adapt to their new surroundings in order to survive so as time passed they evolved. I think it’s called natural selection.
The exchange of oxygen, food, and waste between mother and fetus occur in the placenta.
"How do the atmospheric conditions near the beginning of the Precambrian time contrast with the atmospheric conditions that are present now? Which organism is largely responsible for this change?"
Suggestion: maybe Alexa, Google, etc...
Answer:
It is possible to represent this process graphically by changing the color of the genomic fragment that has been translocated into a new genomic location. Thus, it is simple to observe that a translocation produces a deletion of the genomic fragment and its new localization in the chromosome
