Bio 123: PP10 Material Flashcards
What is a timeline characteristic of animals?
They are much younger in terms of evolution when compared to protists and fungi
When did animals first make an appearance?
First animals were seen around 800 million years ago
What is a timeline characteristic of Dino’s?
They were extinct about 65 million years go
Choanoflagellate
-Most animal like protists
-Are unicellular
-Scientists believe that extant animals today are related to choanoflagellates
Why types of cells to sponges have and what are they used for?
-Collar cells known as Choanocyte
-Are mainly used for feeding
-Choanocyte structures are similar to individual choanoflagellates
Sponges
-Are the most ancient animals on the planet
-They lack true tissue
-Have Choanocyte (collar cells)
What are the 5 general characteristics of animals?
1)Are multicellular, most having tissues, organs, and organ systems
2)Are aerobic heterotrophs
3)Most species reproduce sexually
4) Most species at some stage of life have mobility
5) Lack cell walls
What are some organ systems that animals have?
-Digestion system
-Excretory system
-Circulatory system
Define vertebrates and give examples
Animals that have a backbone
-Includes mammals, birds, reptiles, amphibians, and fishes
Define invertebrate and give examples
Animals that lack a back bone
-Beatles and insects
Invertebrate diversity
Make up over 95% of the known species of animals
Cell membrane
Animals contain a cell membrane that regulates what comes in and out of the cell
Arthropods
The most diverse phylum of animals
Habitat of Sponges
Sponges mainly occupy the marine floor and coral reefs
What are the types of body symmetry of animals?
Radial or Bilateral
Bilateral symmetry
Only has one plane of symmetry through the animals body
Radial symmetry
Animals that have infinite planes of symmetry
Ancestral state
Older and evolved first
Derived state
Trait that came later in evolutionary time
Cephalization
Evolutionary trend of the concentration of sense organs and nerve control that is towards the anterior end of the body (all senses developed in places where they can have close communication with our brain)
e.g. our eyes, ears, mouth, nose, tongue are all sensory organs that developed in the close regions to the brain
What are the terms that describe body regions?
Anterior
Posterior
Dorsal
Ventral
Anterior
Towards the head
Posterior
Towards the tail
Dorsal
Towards the upper part or back of the standing animal
Ventral
Towards the lower part or belly of the standing animals
What is an exception to symmetry?
Sponges are animals but lack symmetry all together
Characteristics of cephalization
Increased cephalization can be found in more complex animals while simpler animals will have decreased cephalization