¿Cómo evolucionaron los peces?

Life evolved in the seas over millions of years, leading to the first vertebrates with primitive spines and skulls. Early fish lacked jaws, but eventually, jaws evolved, revolutionizing feeding and defense. Fish diversified into cartilaginous and bony groups, with bony fish developing swim bladders. Lobe-finned fish marked the transition to land, giving rise to future vertebrate life.

What was the major evolutionary breakthrough of the first fish?

• Ability to walk on land

• Development of lungs

• Primitive spine and skull

• Complex nervous system

Which feature was absent in early fish but evolved later?

• Jaws

• Scales

• Gills

• Fins

What is a characteristic of cartilaginous fish?

• Ability to breathe air

• Skeleton made of cartilage

• Presence of a swim bladder

• Skeleton made of bone

What organ helps bony fish adjust their buoyancy?

• Gills

• Swim bladder

• Lungs

• Heart

Which group of fish is considered the ancestor of all future vertebrate life?

• Lobe-finned fish

• Cartilaginous fish

• Jawless fish

• Ray-finned fish