Science DJ 7th grade Flashcards
A (n) ___________ is an animal that has a notochord, a nerve cord, a tail, and structures called pharyngeal pouches.
chordate
A(n) _______________ is a flexible, rod-shaped structure that supports the body of a developing chordate.
notochord
Most chordates are ___________, but the chordates also include two groups of __________ tunicates and lancelets.
vertebrates, invertebrates
All vertebrates have a(n) ______________, also called a spinal column or spine.
backbone
Bones that form a backbone are called ____________
vertebrae
All vertebrates have digestive systems with two ____________, circulatory systems that move ___________ through the body, and nervous systems that include _____________.
openings, blood, brains
Fish have two important characteristics in common, ________ that absorb oxygen gas from water and paired _________ that aid in swimming
gills, fins
Hagfish and lampreys lack ____________ and are in a group called _____________ fish.
jaws, jawless
Sharks, skates, and rays are ____________ fish
cartilagenous
Jawless and carilaginous fish have internal structures made of
cartilage
Trout, guppies, perch, tuna, mackerel, and thousands of other species have _______________ and are grouped together as _________ fish.
bones, bony
Frogs, toads, and salamanders belong to the class ___________
Amphibia
Most amphibians spend part of their lives in _________ and part on _____________
water, land
Amphibians lay ______ that do not have hard protective coverings, or __________
eggs, shell
Young amphibians live in water and have ____________; most adults develop ____________ and live on land.
gills, lungs
Lizards, ____________, turtles, crocodiles and alligators belong to the class ___________
snakes, reptiles
All reptiles have _____________ skin that is covered in ____________.
waterproof, scales
Like amphibians, most reptiles have three-chambered _________
hearts
Unlike amphibians, lizards and other reptiles have ____________ throughout their lives.
lungs
Most reptiles lay fluid-filled _______________ with ____________ shells.
eggs, leathery
All birds are in the class _________
Aves
Many birds can ___________, and they have stiff ________ _________ that enable them to move through the air.
fly, hollow bones
Birds have ____________ and do not chew their food; instead, their digestive systems include _________________, which are organs that help grind food into smaller pieces
beaks, gizzards
Birds lay fluid-filled ___________ with hard shells and feed and care for their _______________
eggs, young
All mammals have hair or _________ covering their bodies
fur
_____________ glands produce milk that feeds young mammals
Mammary
Although many mammals have _____________ young, a few species, including the duck-billed platypus lay eggs.
live
