Flashcards in Organismal Biology Deck (51)
animals are eukaryotic, which means they have...
- "true nucleus"
- membrane-bound organelles
what does it mean to be heterotrophic?
what do heterotrophic organisms use as energy and carbon source?
what are the modes of feeding?
Most animals have an ___ digestion
aniamls guts are
internal and continuous with the outside environment and permits internal digestion of food items
having multiple cells (multicellularity) means...
cells can become specialized to carry out specific functions and can grow in size
animals don't cell walls so how do they support their body?
muscles contract against fluid-filled cavity
example of an animal with a hydrostatic skeleton
non-living covering that does not grow with animal
- ex: moulting animals
-vertebrates (living tissue)
whats the importance of mobility at some life stage?
-movement reduces competition
- enhances genetic diversity
Somatic (body cells) are ....
animals are ???
what are tissues?
groups of similar cells organized into a functional unit
what type of tissues are there?
what type of connective tissues are there?
tissues can function together as ___ to complete more complex tasks
how many species of animals are there
more than 1 million!
how many are invertebrates?
when did animals evolve?
who are the closest living relatives to animal origins?
colonial choanoflagellate protists
what were the first animals?
when did the first animals live?
1.2 bya -700 mya
when did the cambrian explosion happen?
542 - 490 mya
what happened in the cambrian explosion?
- rapid diversification
- many new phyla were formed
- burgess shale