vertebrates and invertebrates Flashcards
1
Q
what is the phylum chordata
A
the phylum chordata contains animals that have a supporting rod running the length of their body.
2
Q
how do scientists sort vertebrates
A
Scientists separate this group into smaller groups because of their features:
how the animal takes in oxygen – lungs, gills or through the skin
thermoregulation – maintains own temperature (homeotherms) or temperature varies with surroundings (poikilotherms)
reproduction – internal or external fertilisation, lay eggs (oviparous) or give birth to live young (viviparous).
3
Q
why can it be difficult to sort some vertebrates
A
Assigning vertebrates to different groups can be difficult as some might have different characteristics, oxygen absorption, thermoreglulation and reproduction methods
