Final Science Flashcards
(43 cards)
How old is Earth according to scientists?
Earth is 4.6 billion years old according to scientists
What do fossils provide evidence of?
They provide evidence of how life and the environmental conditions have changed over time.
What is the age of Earth based on?
Fossil records
What is a fossil?
A fossil is preserved remains or traces of an organism.
What did scientists create to help them understand the age of the earth?
Geological time scales
What conditions are needed for a fossil to form?
The type of organism and the environmental conditions in which it dies.
What happens to organisms when landmasses split or when the climate changes?
They evolved
What are the geologic time scale categories (4)
eon, era, epoch in order.
Which type of rock are you most likely to find a fossil?
Sedimentary Rock
What is adaptation?
The organism’ ability to change to respond the environment
How do organisms inherit their traits?
Their parents
What traits can you inherit?
Eye color, face shape, and hair color
What are all organisms constantly working towards?
They are striving to survive
Which animal species is most likely to survive as humans change their environment?
Those that will best be able to adapt to the changes are more likely to survive.
What is camouflage?
Color or pattern on an animals’ body to help blend in from predators
What is genetic variation?
Presence of natural differences within a species
What is natural selection?
The theory stating that natural variation among organisms that make them best adapted to their environment live and reproduce, therefore passing on to their offspring the genetic qualities best suited to that environment
What type of population growth do developed countries have
Not a lot of population growth
What type of population growth do developing countries have?
There is a lot of population growth
What are some problems human population growth causes?
More burning of fossil fuels, more traffic, more pollution
What is the world’s population now? What is the world population estimated to be in 2050?
8 billion and the it is estimated to be 9 billion
How often does Earth’s population double in size?
The Earth’s population doubles every 50 years.
How does growing populations affect transportation?
Growing populations affect it because It can be hard to move millions of people around big cities.
What tends to happen to the populations in developing countries over time, as the countries become more developed?
Growth eventually slows down.
