ENVIRONMENTAL IMPACT OVER TIME

1
ENVIRONMENTAL IMPACT OVER TIME

• Chapter 2 Section 3

2

• What types of factors can affect the survival of
  a species?

• Nonliving Influences
• Temperature
• Rainfall
• Pollution
• Fire
• Elevation
• Volcanic eruption
• Flooding

3

• Living Influences
• Predators
• Competition for food
• Competition for territory

4

• Who are Charles Darwin and Alfred Wallace?

• British biologists
• Hypothesizing about how so many living things
  came to exist on Earth

5

• What was their hypothesis?

• Different, long-term, environmental influences on
  populations produced the variety of species
• Changes happen from generation to generation

6

• What did Darwin and Wallace call this process?

• Evolutionthe change in the genetics of a species
  over time.
• Theory to explain how, over time, factors can act
  together and result in a new species.

7

• How does evolution happen?

• Natural Selectionorganisms that are better
  adapted to an environment survive and reproduce
  at a greater rate than organisms that are not
• Can produce new organisms or new species

8

• What are other ways that species can change?

• Mutation
• Changes that occur to DNA
• Favorable mutationsnew species
• Harmful mutationsstop reproduction or death to
  organism

9

• Selective Breeding
• People select animals with desirable traits for
  breeding
• Ex Labradoodle

10

• Adaptive Radiation
• Production of several species from one ancestral
  species
• Occurs when environment favors more than one
  variation
• Ex Darwins finches

11

• What are two reasons for extinction?

• Habitats are destroyed
• New species are introduced that crowd out or prey
  on existing species