Tiktaalik: From Sea to Land

What was the state of life on Earth approximately 385 million years ago?

• Land was teeming with diverse life.

• Oceans were barren.

• Land was mostly empty, while oceans were full of life.

• Both land and oceans were largely uninhabited.

During which geological period did fish begin their transition onto land?

• Mesozoic Era

• Cenozoic Era

• Devonian Period

• Archean Eon

Which of the following characteristics describes Tiktaalik?

• Delicate fins like a goldfish.

• A fully developed pelvis and strong limbs for walking on land.

• A fishy body with a salamander-like head and leg-like fins.

• Primarily a land-dwelling creature with no gills.

What anatomical feature provides the most important clue about when Tetrapodomorphs first became able to breathe air?

• The presence of gills.

• The absence of lungs.

• The shape and location of the spiracular tract.

• The size of their fins.

What organ most likely evolved into lungs?

• Swim Bladder

• Gills

• Esophagus

• Intestines

What was the most compelling evidence to suggest an organism like Tiktallik was an ancestor to modern tetrapods?