classification
- Created by: Izzy 02
- Created on: 09-05-15 12:01
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- classification
- Variation . A species is a group of organisms that can reproduce with another to produce an offspring that can also reproduce.
- You can get variation between different species or different members of the same species.
- Sometimes there is a relationship and correlation between two features . A relationship isshown on a line graph ,going steadily up or down.
- variation can have environmental or inherited causes .
- Environmental variation is the conditions in which the organisms surroundings is in . Humans are affected by environmental variation by sunburn and scars .
- Inherited variation is caused by features being passed down form parents to their offspring eg; natural hair colour , eye colour
- Classification , There are so many species that we have to put them into groups
- Vertebrates are animals with back bones there are 5 types of vertebrates . Inverterbrates are species without backbone there are 8 of them .
- Amphibians have moist skin , lay eggs In water and the eggs have a jelly coating
- Birds have feathers , and lay eggs in a hard shell.
- Reptiles have dry scales and lay eggs in a leathery shell
- Mammals have hair , produce milk and give birth to live offspring
- Fish have wet scales , have fins to move and gills to breathe with .
- Arthropodes have jointed legs bodies in sections and thick hard exoskeleton eg;
- Molluscs have fleshy pad for movement
- echinoderms have bodies on 5 parts and a spiny outer covering.
- crustceans have 5-7 pairs of legs and a chalky shell.
- insects have 3 pairs of legs and bodies in 3 sections
- arachnids have 4 pairs of legs and bodies in 2 sections .
- centipedes and millipedes have many pairs of legs and many bodie sections
- Molluscs have fleshy pad for movement
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