science 2

Question 1

law of superposition-

Answer 1

rocks closer to the surface

Question 2

law of cross-cutting-

Answer 2

rocks that cross other rocks are newer

Question 3

calenders-

Answer 3

finds relative age

Question 4

radioactive dating-

Answer 4

finds absolute age

Question 5

index fossils-

Answer 5

determines certain rock layers

Question 6

vertebrate-

Answer 6

backbone

Question 7

invertebrate-

Answer 7

no backbone

Question 8

homologous-

Answer 8

similar structure, different function

Question 9

analogous-

Answer 9

similar function, different structure

Question 10

natural selection-

Answer 10

organisms that evolve to get better traits

Question 11

artificial-

Answer 11

humans interfere, selecting beneficial traits

Question 12

genetic engineering-

Answer 12

changing genes, extracting traits that make it have the desired traits

Question 13

homozygous dominant-

Answer 13

AA

Question 14

homozygous recessive-

Answer 14

aa

Question 15

heterozygous-

Answer 15

Aa

Question 16

phenotype-

Answer 16

physical traits

Question 17

what does DNA stand for?

Answer 17

Deoxyribonucleic Acid

Question 18

three types of mutations

Answer 18

beneficial, neutral, harmful

Question 19

relative dating-

Answer 19

process of determining if one rock or geologic event is older or younger

Question 20

key beds-

Answer 20

thin layer of rock that is unique and wide spread

Question 21

biological fitness-

Answer 21

the ability of an organism to survive and reproduce

Question 22

vestigial structure-

Answer 22

sometimes species evolve and they don’t need a certain body part anymore