Here are the answers to the questions on your study guide.
1. Identify the characteristics of all animals
To be classified as an animal, an organism must meet four main requirements:
* They are
multicellular (made of more than one cell).
* They are
eukaryotes (their cells have a nucleus).
* They are
heterotrophs (they cannot make their own food like plants; they must eat other organisms for energy).
* Their cells
lack cell walls (unlike plants and fungi, animal cells only have cell membranes).
2. List the three organisms that are vertebrates
Vertebrates are animals that have a backbone or spinal column. Looking at the list of animals in the illustration:
* The
Gerbil is a mammal and has a backbone.
* The
Frog is an amphibian and has a backbone.
* The
Porcupine is a mammal and has a backbone.
(The Barnacle, Jellyfish, Sponge, Sea star, and Spider are all invertebrates, meaning they do not have backbones.)
Final Answer:
1. Characteristics of all animals: Multicellular, eukaryotic, heterotrophic, and lack cell walls.
2. Three vertebrates: Gerbil, Frog, Porcupine.
Parent Tip: Review the logic above to help your child master the concept of introduction to animals worksheet answer key.
