what is the nitrogen cycle?
What is the carbon cycle?
What id the evidence for evolution?
-fosils that have been discovered share similarities with other animals
-DNA in animals is nearly the same as close relatives
How does evolution work?
An example of natural selection is:
Where cows have short and long legs
Cows with small legs are eaten by predators, leaving cows with long legs, meaning that the cows will evolvle to have long legs
What was Lamarck's theory of evolution?
He believed an animal had a characteristic which they inhierited from their parents, such as a giraffe that has a long neck because their ancestors had them.
Key words to use
Variation- diversity of species
Adapted-adjusted or evolved to their environment
Interdependence- everything depends on each other
what is mutation?
This is where DNA does not copy corectly causing variation
What is selective breeding?
Selective breeding is where humans choose charcteristics of dio give a different plants or animals to combine to give a desired result. this is articial
How do we feel?
What is a stimulus from the nervous system?
It is quick
What is a hormonal stimulus?
This takes longer to come into effect
An nervous stimulus
ADH controling water balnce in the body
Insulin controling sugar levels
How are organisms linked in a food web?
this is where every element is dependent on each other.
What is the formula for energy transfer?
energy in tissues diveded by energy in food eaten
What are non-living indicators of environmental changr?
carbon dioxide levels
What are living indicators of environmental change?
Levels of phytoplankton
What is extinction?
Thie occurs when an organism can not adjust to environmental changes like an introduction of a new species unnaturally
Why is biodiversity important?
It allows more complex food webs to exist which is the rainforest for example, which provides most of our worlds medicines
How do we maintain biodiversity?
limit selective breeding
How do we increase sustainibility
form communal groups and share resources
implement biodegradable packaging