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Evolution/Human Family Tree (Natural Selection summary-of-topic-41…
Evolution/Human Family Tree
Natural Selection
Natural selection explains how life started
Charles Darwin learned that all living things shared a common ancestor
There are differences in a family (variations)
Organisms that fit their environment the best will survive and reproduce
Natural selection is the same thing as "the survival of the fittest"
Natural selection causes evolution
Human Evolution
Humans are part of the primate group
Humans and apes share a common ancessotr
Paleontologist have found fossils of past humans
Modern humans are homo sapiens
The oldest human fossil was found in Africa
Humans evolved to have larger brains, become taller, use tools, and create communities
Charles Darwin
Charles Darwin developed the Theory of Evolution
While traveling, he studied many plants and animals
He observed that the animals were different depending on there environment
He wrote the book called "The Origin of Species"
He disagreed with other scientist because he thought evolution takes a long time to happen
The theory of evolution is supported by a lot of evidence
Fossils
A fossil is the remains of something that died a long time ago
Not everything becomes a fossil, which is why the fossil record is incomplete
There are different types of fossils, such as body, trace, mold, and cast
Over millions of years, dead plants were compressed to form coal
Oil, gas, and coal come from fossils (fossil fuels)
Fossils tell us about Earth's History
Plant Adaptation
Living things need to adapt to meet their needs
Plants adapt to get sunloight by growing towards the sun
Plants adapt to get water by having roots underground`
PLants adapt to get doof by using soil, animals, or other plants
Plants adapt to reproduce by spreading their seeds (pollen)
Flu and Flu vaccine
Flu is caused by the influenza virus
The flu can cause symptoms such as a fever
Before the development of medicines, the Spanish flu killed many people
We have developed vaccines to fight off viruses
Viruses have different strains (version) based on their genes
viruses can mutate and evolve
Extinction
99% of species that lived on Earth have gone extinct
Mass extinction is when a large number of species dies quickly
Extinction is when a while species dies out
Along with climate change, evolutionary pressures can lead to extinction
About 65 million years ago, dinosaurs were extinct
Human activities can cause extinction which can affect us and the environment in a negative way
Human Family Tree
Paranthropus Group: large teeth and powerful jaws enabled them to eat a variety of food
Australopithecus Group: Regularly walked up right but still climbed trees as well
Homo Group(us): has large brains, used tools. First to expand out of Africa :
Ardipithecus Group: Evolved in Africa and the first group to walk upright
