Chapter 25 “What is an Animal”

Chapter 25 Characteristics of Animals Eukaryotic Multi Cellular Have ways of moving – Help reproduce – Obtain food – Protect themselves Specialized cells for nerve and muscle tissue

Chapter 25 Characteristics of Animals (cont.) Cells do not have cell walls Most adults are fixed in size and shape – They do not continue to grow throughout their life

Chapter 25 Characteristics of Animals (cont.) Methods for Obtaining Food: All animals are heterotrophic (consume food) All animals depend on autotrophs (directly or indirectly) Some animals move from place to place and others remain stationary. – Organisms that stay stationary are known as sessile (SES ul)

Chapter 25 Characteristics of Animals (cont.) Animals Must Digest their Food: Heterotrophs must ingest their food, after ingestion they must digest. – Some animals digestion is carried out within cells, in other animals it takes place in an internal cavity – Some of the food consumed and digested is stored as fat or glycogen and is used when food is not available.

Chapter 25 Characteristics of Animals (cont.) Animal Cell Adaptations: Most animal cells are adapted to carry out different functions – Sense and seek out food – identify and protect themselves