What animals do to survive:

1. Feeding:

Herbivore = eats plantsCarnivore = eats animalsOmnivore = eats plants and animalsDetritivore = feed on decaying organic materialFilter Feeders = aquatic animals that strain food from waterParasites = lives in or on another organism (symbiotic relationship)

2. Respiration:

Take in O2 and give off CO2 Use: Lungs, gills, through skin, simple diffusion

3. Circulation:Very small animals rely on diffusionLarger animals have circulatory system

4. Excretion:

Remove waste products from the body.Specialized organs like kidneys in complex animals.

5. Response to stimuli:Receptor cells pick up stimuli = sound, light, external stimuli

6. Movement:Most animals are motile (can move)Muscles usually work with a skeleton

7. Reproduction:Most reproduce sexually = genetic diversity

Many invertebrates can also reproduce asexually = to increase their numbers rapidly