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1.What does research say caused the development in dogs?
a) dogs becoming pets
b) climate change
c) better dog food
d) cats
2.How long ago did dogs resemble cats?
a) 14 million years ago
b) 400,000,000 years ago
c) 40 million years ago
d) 140,000,000 years ago
3.What habits of dogs changed?
a) nocturnal habits
b) bad habits
c) sleeping habits
d) food-gathering habits
4.What became less dense in North America?
a) brains
b) forests
c) fog
d) smoke
5.What did dogs grow to be able to hunt better?
a) longer legs
b) sharper teeth
c) silkier hair
d) wider paws
6.How many different species of dog did scientists look at?
a) 32
b) 38
c) 33
d) 34
7.What did the scientists say dogs were good indicators of?
a) revolutionary charge
b) pets
c) dogs
d) evolutionary change
8.What do the elbows in cats allow them to do?
a) swipe
b) swirl
c) swivel
d) swift
9.What could dogs do for a longer time after their elbows changed?
a) bark
b) eat
c) sleep
d) run
10.What part of a dog became harder wearing?
a) fur
b) teeth
c) paws
d) collars
