Chordate features in the human embryo would be?
- a rod between the digestive tract and nerve cord; for support and attachment site for muscles.
Dorsal nerve cord
Pharyngeal gill slits
Invertebrate Chordates lack a _______.
A fishlike invertebrate chordate is a ________.
An animal that has a vertebral column is a _____?
- Have a backbone
-A bone or cartilage vertebral column that replaces the notochord-
-Vertebrate success associated with paired appendages and greater size and complexity of the brain and sensory structures.
What are the major groups of vertebrates?
: slimy residents of the ocean floor
are parasitic, attaching to fish with suckerlike bouths lined with rasping teeth(inset)
are marine predators
_______ fishes are the most diverse vertebrates.
______ means "double life."
Characteristics of amphibians.....
Poorly developed lungs
supplemented by the
use of the skin as a respiratory organ
Characteristics of Reptiles?
1. Reptiles have
Tough, scaly skin
Shelled amniote egg
; skin not needed as a respiratory organ
Modified three-chambered heart
that minimizes mixing of oxygenated and deoxygenated blood
Characteristices of birds?
High metabolic rate
Four chambered heart
Lungs supplemented by air sacs.
Characteristics of placental mammals?
- Provide milk to their offspring via mammary glands
- High metabolic rates; warm-blooded
- Protected and insulated by fur
- Four-chambered hearts
- Legs for running and bodies adapted to varied lifestyles
- Varied forms of development (monotremes, marsupials)
Structure formed by interweaving of lining of uterus & embryonic membranes; functions in gas, nutrient & waste exchange between embryonic & maternal circulatory systems and secretes hormones.
Examples of non-placental mammals are?
such as a
lay leathery eggs resembling those of reptiles.
such as the
give birth to extremely immature young who immediately grasp a nipple and develop within the mother's protctive pouch (inset).