earth science presentation for tech class
TRANSCRIPT
Earth Science/Living
Creatures By: Brady Arnold
Table of Contents
1. Amphibians
2. Reptiles
3. Mammals
What is an Amphibian? •Amphibians
•Vertebrate animals (Animals with a spine)
•Toads •Frogs •Salamanders. •Characterized as cold-blooded.
•Most Amphibians transform from water-breathing young animals to adult air-breathing animals.
•The 3 orders of amphibians
•Frogs and toads •Salamanders and Newts •Limbless amphibians that resemble snakes
Amphibians Continued • Amphibians
– Approximately 6,500 species.
– Lay their eggs in water.
• Amphibians are similar to reptiles, but reptiles are amniotes (come from an egg), along with mammals and birds.
• There has been a dramatic decline in amphibians around the world. – Many species are threatened or extinct.
Different Kinds of Amphibians
What is a Reptile? •Reptiles
•Air-breathing •Cold-blooded vertebrates •Lay shelled eggs •Have skin covered in scales.
•They are Tetrapods
•Having four limbs or being descended from four-limbed ancestors.
•Modern reptiles inhabit every continent with the exception of Antarctica.
Reptiles Continued • Four reptile groups that are recognized
• Crocodillia: Crocodiles and alligators (23 species)
• Sphenodontia: Tuataras from New Zealand (2 species)
• Squamata: lizards, snakes, and worm lizards (9,150 species)
• Testudines: turtles, tortoises: (300+ species)
• Unlike amphibians, reptiles do not have an aquatic larval stage. • Reptiles are oviparous (egg-laying).
Different Kinds of Reptiles
What is a Mammal? •Air-breathing vertebrate animals
•Endothermic (Maintain own body heat)
•Hair
•Three middle ear bones
•Mammary glands (Exists in mothers with babies).
•Sweat glands
•Specialized teeth
•Most have a placenta (This feeds the offspring during pregnancy.)
•The mammalian brain regulates the endothermic and circulatory systems (the blood in the body)
•Circulatory System is operated with a four-chambered heart.
•Mammals range in size from the 1.5-inch Bumblebee Bat to the 108-foot Blue Whale.
Mammals Continued • All female mammals nurse their young with milk, which comes out
from special glands called mammary glands.
• All living mammals give birth to live young. • The 3 largest mammal groups are:
– Rodentia: (mice, rats, porcupines, beavers, capybaras, and other gnawing mammals)
– Chiroptera: (bats) – Soricomorpha: (shrews, and moles).
• The next 3 largest mammal groups are:
– Primates: (humans, Apes, Monkeys) – Cetartiodactyla: (hoofed mammals and whales) – Carnivora: (dogs, cats, weasels, bears, seals, and their relatives)
Pictures of Mammals