Evolution, Theories And The Earth

Question 1

What is the theory of evolution

Answer 1

All organisms on Earth have evolved from simple single celled organisms millions of years ago

Question 2

What evidence is there for the theory of evolution

Answer 2

Fossil fuels show how animals have changed over time.

DNA and physiological similarities

Question 3

How does natural selection link to evolution

Answer 3

Organisms evolved through natural selection:

• variation where one organism has an advantage in the environment
• organism now more likely to survive
• organism more likely to breed and pass on their advantageous genes

Question 4

How did darwins theory suggest animals and plants evolved from simple organisms

Answer 4

Simple organisms evolved through natural selection more than 3 billion years ago

Question 5

Differences between darwins and lamarcks theory and what they suggested

Answer 5

Darwin suggested genetic info was passed from parent to offspring.

Lamarck suggested environmental factors causing a change in a organisms lifetime were passed on so giraffe stretches neck for food so offsprings neck will also be larger

Question 6

Why was theory of natural selection gradually accepted

Answer 6

There was thought to be insufficient evidence but was later found out it was true 50 years later after publication

Question 7

What May cause an organism to become extinct

Answer 7

New disease

Changes to environment

New predators

New competitors

Question 8

How can an increase in human waste pollute the earth

Answer 8

Water-sewage,fertiliser and toxic chemicals

Air-smoke, gases sulphur dioxide acid rain

Land- toxic chemical pesticides and herbicides which can be washed from land to water

Question 9

What are impacts caused by our rapidly increasing population

Answer 9

Raw materials are being used up like non renewable energy resources. More waste and more pollution