Evolution
What were the first animals to come from eukaryotic cell clusters?
Sponges
What is the primary material that arthropod exoskeletons are made of?
Chitin
How do arthropods contribute to nutrient cycling?
They decompose organic matter.
Which environmental changes caused aquatic animals to migrate to land?
Temperature changes, humidity changes, continental drift.
What environmental change led to the development of the amniotic egg?
Move from aquatic habitats to terrestrial environments.
What do arthropods produce that can be used for both commercial and medicinal purposes?
Beeswax and spider webs
Describe the evolution of the jaw.
The skeletal rods in the gill slits continued to get longer until they fused together. Over time they got larger in size and got thicker. Teeth then formed.
What are the steps that allow movement using tube feet for animals in Phylum Echinodermata?
water expelled from bulb to flex leg, sticky substance secreted, 2nd substance secreted to break down sticky substance
What field are Echinoderms most commonly used as model organisms in and why?
Developmental biology because their embryos develop rapidly and are easy to observe