In this unit, we covered how evolution works and how it has affected today’s Earth. Variation exists in all species, as it’s any difference in traits within a population. Charles Darwin made great contributions in understanding evolution with his four observations: sexually reproductive species have high genetic variation; all species can produce more offspring than their environment can support; traits are inherited from parents; and not all offspring survives due to limited sources. Natural selection favors certain phenotypes, where the better phen/otypes survive. Speciation is the rise of two or more species from an existing one, through behavioral isolation or temporal isolation. Scientists have discovered evidence of evolution through embryology, vestigial structures, fossils, homologous structures, and analogous structures. There are five different ways a population can change: genetic drift, mutations, gene flow, sexual selection, and natural selection. Life on Earth has gone through four eras where it started from a single atom, developing into what is it is today relatively fast.
This unit
was the most
interesting one for
me so far,
so naturally, it
was easier to
maintain good study habits. I completed my vodcasts earlier than I usually do and made
sure to keep
up with my
textbook notes. I
am a better student because I
was more organized and interested.
I was
fascinated about how
Earth has evolved. I would love
to follow up
on the mass
extinctions Earth has
experienced and the
species affected.
Last unit,
I determined I
was already confident and assertive. I
maintained my assertiveness by valuing everyone’s ideas and
listening well. I
stood up for
myself by making sure not to
be knocked down
by the competing variations in the
labs.
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