Griffith Week 5 9/16-9/20

What does EXTINCTION mean?

• All of the organisms of one type of species die and disappear from the world.

• All of the organisms from one area die.

• All the species in one area disappear.

• All of the animals of one kind disappear from one area.

How many mass extinctions have there been in the history of the earth?

• 
  

• 4

• 6

• 5

• 1

How do we know that we are in a period of mass extinction?

• 
  

• People are eating too many animals.

• Species are going extinct at a slower than normal rate.

• We are finding lots of dead species in field studies.

• Species are going extinct at rates that are much faster than normal.

True or False:

Introducing a species into a new area can cause other species to go extinct.

• 
  

• TRUE

• FALSE

• Scientists do not know

The Anthropocene is known as the ...

• Age of dinosaurs

• Age of Human impact

• New Age of mankind

• Age of fishes

How do geologists determine the changes between epochs on the geological time scale?

• Changes in climate

• Changes in solar output

• Changes in fossils

• Changes in climate and fossils

What things have humans put in the world that have never existed before?

• 
  

• Gold, silver and lead

• Plastics and plutonium

• Certain plants and animals

• New types of cheese

What is the most likely reason that humans caused the disappearance of various species?

• 
  

• Changing of animal habitats

• Hunting for food/materials and habitat

• • Domestication of animals

In the article "Why do dogs wag their tales.." we learned that selective breeding is

• when two living things with certain desirable traits are intentionally bred by humans.

• when dogs choose their own mates.

• when animals that are domesticated have been genetically adapted over generations

In the article "Why do dogs wag their tales.." what did the researchers learn about dogs' tail wagging compared to other animals?

• dogs wag their tales to scare away predators

• dogs wag their tales less often than wolves.

• dogs wag their tales faster and more often than other animals

• humans don't like dogs wagging their tales