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Chapter 1: Small An

Veterinary Science

TermDefinition
Paleontologist A scientist who deals with prehistoric life
Aves The taxonomic classification for birds
Placenta Mammalian organ that nourishes a growing embryo
Invertebrates Animals without backbones
Taxonomy The scientific naming of species
Bony fish The oldest vertebrate group
Chordata Animals with a spinal cord
Notochord The embryonic stage of the vertebra
Isotope An atomic form
Stromatolites Layered structures created by algae and bacteria
Monera Bacterial organisms
Arthropods Invertebrates with jointed legs
Protista Single-celled animals including algae
Dinosaurs and marine reptiles were most abundant during what period? Cretaceous
Who is credited with developing the system for the naming of species? Carolus Linnaeus
What is the system for the classification of species? Binomial nomenclature
What is the naming of species? Taxonomy
List 1 (of 4) characteristics of mammals Produce milk
List 1 (of 4) characteristics of mammals Have hair
List 1 (of 4) characteristics of mammals Have a placenta to nourish the growing embryo
List 1 (of 4) characteristics of mammals Give birth to live young
What two species of mammals lay eggs? a. Echidnas b. Platypuses
When did Jawed fish first appear? Silurian
When did Amphibians first appear? Devonian
When did Reptiles first appear? Pennsylvanian
When did Dinosaurs first appear? Triassic
When did Birds first appear? Jurassic
When did Placental mammals first appear? Paleocene
When did Apes first appear? Oligocene
When did Large carnivores first appear? Pliocene
When did life on Earth begin? 3.5 to 4 billion years ago based on fossil evidence, chemical signatures, and geological context.
When did plants first appear on Earth? around 470 to 500 million years ago, as indicated by fossil evidence, macrofossils, molecular data, and geochemical evidence.
Why weren't plants the first form of life on Earth? Simple microbes evolved first because they were well-suited to early Earth's conditions
How does the Woese classification system differ from Linnaeus's? Uses molecular evidence to reflect evolutionary history and introduce domains, reshaping our understanding of microbial life.
What are the one characteristics of the phylum Chordata? An embryonic notochord that is usually replaced by the spinal cord
What are the one characteristics of the phylum Chordata? A dorsal, tubular nerve cord
What are the one characteristics of the phylum Chordata? Pharyngeal gill slits
What are the one characteristics of the phylum Chordata? A post-anal tail.
Reptile Dry scale skin
Reptile Breath through lungs
Reptile Lay eggs with tough shells
Amphibian Moist skin
Amphibian Breath through skin
Amphibian Lay soft eggs
Reptile and Amphibian Vertebrates
Reptile and Amphibian Reproduce externally
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