Warmth and vegetation were the two big things. Since everything was ice, animals would've died of hypothermia or something, and the ice wouldn't allow any vegetation to grow. It's kind of like the dinosaurs; the plant eaters died b/c they didn't have any vegetation to eat, and the meat eaters died b/c they didn't have any meat to eat since the animals died. Same thing happened in the ice ages. Just with the added variable of freezing temperatures.
1) responsiveness to the environment;
2) growth and change;
3) ability to reproduce;
4) have a metabolism and breathe;
5) maintain homeostasis;
6) being made of cells; and.
7) passing traits onto offspring.
Hope this helped. ;)
Carbohydrates- cellulose cell wall in plants, chitin exoskeleton & fungal cell wall
Lipids- cell membrane (phospholipids)
Protein- Fibrous ( skin, fingernails, horns, feathers)
Necleic acid- stores genetic info(dna)
Your answer is going to be medium
I think it is because they are invasive species