chapter 25

Question 1

3 ways tetrapod skulls changed overtime

Answer 1

multiple lower jaw bones to one, one type of tooth to multiple, inner ear bones

Question 2

sequence of key events in history

Answer 2

origin of Earth, prokaryotes, production of oxygen, eukaryotes, multicellular organism, animals, organisms with hard body parts, colonization of land

Question 3

oxygen shot up rapidly to 1%-10% present level

Answer 3

oxygen revolution

Question 4

what caused the oxygen revolution

Answer 4

cyanobacteria

Question 5

the appearance of fossils resembling many animals groups and provides first evidence of predator-prey interactions

Answer 5

cambrian explosion

Question 6

continents move overtime

Answer 6

continental drift

Question 7

number of species rapidly become extinct worldwide

Answer 7

mass extinction

Question 8

rapid period of evolutionary change where new species arise

Answer 8

adaptive radiation

Question 9

what are the 2 ways living things can look different?

Answer 9

sequences(mutations) and regulation of developmental genes

Question 10

control the rate and timing of body growth from fertilization to adult

Answer 10

developmental genes

Question 11

1 type of developmental gene that determines where an organism’s features will develop

Answer 11

homeotic genes

Question 12

1 type of developmental gene that determines where an organism’s features will develop in animals

Answer 12

Hox genes

Question 13

changes in the form of an organism may be caused more often by changes in their sequence

Answer 13

gene regulation