5.1. The main characteristics of animals

Animals are aukaryotics and multicellular organisms. They usually have organs and systems that are highy developed and so they can perform their vital functions very efficiently.

Their vital functions are:

• Nutrition. They have organs that allow them to get large quantities of energy and nutrients.
• Interaction. They have sense organs, a nervous system and structures like legs, tentacles, wings....
• Reproduction: Animal reproduction can be asexual or sexual.

We can cassificate the animals in two big groups:

• Vertebrates. Have an internal skeleton with backbone.
• Invertebrates. Do not havean internal skeleton.

The main animals groups are:

http://www.edistribucion.es/anayaeducacion/8420042/SC1_UNI5/U05_01_EPI_01/05_1/index.html

1. Copy the diagram in your notebook, then click in the picture and do the exercise.

2. Write the meaning of: Backbone, skeleton and wing.

4.2 The kingdom funghi

Introduction to the kingdom of fungi.

There are about 40,000 different kinds of fungi.
These include:

*mushrooms
*moulds
*yeasts

Fungi are not green because they do not contain chlorophyll.
Because they are not green, fungi do not make their own food.

Most fungi feed on the remains of dead plants and animals.

Fungi are decomposers - they change dead things into a substance called humus.
Humus is rich in nutrients.
Soil rich in humus enables new strong plants to grow and provides a home for thousands of living things.

1. Why fungi are not plants?
2. Translate mushrooms, moulds and yeast an write a example of each one.

4.1 Ameba reproduction

1. What kingdom belong amebas?
2. What kind of reproduction is it?
3. What chacarteristics have this kind of reproduction?