Homologous Structures Lesson

Similar & different body structures

Similar & different ecosystems

Similar & different niches in environments

Similar & different behaviors

Similar structures from a common ancestor

Different structures from a common ancestor

Useless body parts that were useful in the past

Similar timing and stages from a common ancestor

They have a common ancestor

They do not have a common ancestor

They evolved in a similar environment

They are unrelated

Their structures evolved for the same environment

They share a common ancestor

Their structures evolved and are now considered useless

They liked the way other organisms looked

They have a common ancestor

Birds evolved from insects

They do not have a common ancestor

They live in different environments

They provide evidence of common ancestry.

They provide evidence that different species have evolved to adapt to different environmental pressures.

They provide evidence that species evolve because they are remnants from ancestral forms.

bee wings and bird wings

legs on a beetle and legs on a cat

whale flipper and bat wing

human eyebrows and ant antenna

1, 2

1, 3

2, 3

1, 2, 3

have the same basic structure

Perform the same function

Are the same size

Are parts of mammals

bat & butterfly

bat & bird

butterfly & bird

bat, butterfly, & bird