The oldest meteorite<span> fragments found on </span>Earth<span> are about 4.54 billion years old; this, coupled primarily with the dating of ancient </span>lead<span> deposits, has put the estimated age of Earth at around that time.</span>[38]<span> The </span>Moon<span> has the same composition as Earth's </span>crust<span> but does not contain an </span>iron<span>-rich </span>core<span> like the Earth's.</span>
The answer is;
The population size is now not large enough.
This is referred to as a
bottleneck effect. Due to the calamity
wiping out a huge chunk of the population,
the variation in the population reduces. The genetic
drift is, therefore, more pronounced on the small
population than big population due to reduced sampling. The reduced
genetic variation makes the population vulnerable
to environmental changes because natural selection will not find a wide variation of genotype to act upon.
Answer:
Pinocytosis is the mechanism by which living cells consume liquid droplets. Endocytosis is the general mechanism by which cells ingest foreign substances and collect them in special membrane-bound vesicles within the cell. Pinocytosis is one form of endocytosis.