Question

52 the limbs of several organisms are shown in the illustrations below. scientists sometimes compare the limbs of these organisms to look for evidence of common ancestry. evolution warm - up 2
whale
horse
bird
cat
bat
human
these limbs provide evidence of common ancestry because they -
f have the same basic structure
g perform the same function
h are the same size
j are parts of mammals
43 three species of lizards of the genus gallotia are found on the canary islands, a chain of seven volcanic islands off the west coast of africa. the easternmost island, lanzarote, is the oldest, while the westernmost island, el hierro, is the youngest. the distribution of lizard species is shown on the map below.
distribution of gallotia lizard species on the canary islands
la palma
la gomera
el hierro
tenerife
fuerteventura
lanzarote
gran canaria
which statement about the ancestry of the lizards from the genus gallotia is best supported by this information?
a the common ancestor of the lizards first colonized the island of el hierro
b the ancestors of each species came from different continents
c the common ancestor of the lizards probably came from africa
d the ancestors of each species evolved in spain and were brought to the islands at different times

Explanation:

For the first part about the limbs of organisms, homologous structures (limbs with same basic structure) indicate common ancestry. For the lizard - distribution question, the different species on different islands likely evolved from ancestors that colonized at different times.
For the limb - related question, the limbs have the same basic structure which is evidence of common ancestry. For the lizard question, the fact that different species are on different islands suggests ancestors colonized at different times.

Answer:

1. F
2. D