extra questions b14

Question 1

list all the possible causes of extinction

Answer 1

• global warming
• volcanic activity
• asteroid collision
• new predators/pathogens
• competition for food/mates
• lack of habitat

Question 2

what name is given to all organisms living in the same habitat?

Answer 2

a community

Question 3

why could scientists not be sure why a species became extinct

Answer 3

lack of evidence

Question 4

Give evidence from the graph (positive correlation) that beak depth is an inherited characteristic

Answer 4

Offspring have similar beak depth to parents

Question 5

Give evidence from the graph that one or more genes control beak depth

Answer 5

Parents of a given beak depth produce offspring with several beak depths

Question 6

Suggest why both species of finch are able to live on Isabela island

Answer 6

• isabela is a larger island with more variety in seed sizes
• so no competition for food

Question 7

Suggest how ancestors of modern lemurs reached Madagascar

Answer 7

Carried by currents on masses of vegetation

Question 8

Why does a fat store help a camel survive in the desert

Answer 8

Can be respired to water

Question 9

Why does a hard mouth help a camel survive in the desert

Answer 9

So it can eat tough desert vegetation

Question 10

Describe the type of evidence used for developing the theory of animal migration

Answer 10

• fossil record
• DNA analysis of living species

Question 11

How have the feet bones of horses changed in the past 50 million years

Answer 11

• they have gotten longer
• there are less bones touching the ground

Question 12

Explain one advantage to the ancestor of the modern horse having more toes

Answer 12

• larger surface area on the ground
• less likely to sink into the soft mud

Question 13

How does a fossil form

Answer 13

• parts of an organism have not decayed
• because one or more of the conditions for decay were absent
• hard parts of organisms replaced by miners
• and become part of the rock
• over very long periods of time