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Biology ­ Unit 2…read more

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To classify living things, biologists observe their features/characteristics,
observing both similarities and differences. Living organisms that share a lot of
similar characteristics are grouped together. If organisms have lots of differences
they are classed in different groups.
Biologists have divided the animal kingdom into many phyla, based on animal's
physical characteristics. Phyla include: cnidarians(jellyfish), annelids(earthworms),
arthropods(insects), molluscs(slugs) and vertebrates(fish).
Arthropods are largest animal family, representing about 75%of animal species
and divided into four classes: myriapods(millipedes), crustacea(crabs), arachnids
(spiders), and insects(butterflies).
Classifying is not very easy as some organisms fit into more than one group.…read more

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Kingdom Characteristics Example Organisms
Plants Made of many cells Flowers, mosses, grasses
Cell wall made of cellulose
Cells contain chloroplasts
Use light to make food by
Grow in a spreading manner
Animals Made of many cells Fish, insects, humans
No chloroplasts
Unable to make food so feed on
other organisms
Compact body shape
Most capable of moving around
Fungi Cell walls made of chitin Mushrooms, toadstools, yeast
Reproduce by forming spores
Do not photosynthesise
Protoctista Mostly single celled but large algae Amoeba, algae
Prokaryotes No nucleus Bacteria…read more

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Keywords and Definitions:
Classification ­ sorting organisms into groups according to their characteristics.
Kingdom ­ major subdivision in the classification of living organisms.
Vertebrate ­ animal with a backbone.
Arthropod ­ animal with a segmented body and jointed legs.…read more

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Binominal system is used to name species, each species is known by a two part
name. First name is the genus (group name for closely related species), and the
second name identifies a single species.
Evolutionary link, sharing the same ancestor, yet looking very different, e.g. dogs,
there are many different types.
Closely related species may look very different if they live in different habitats.
For this reason they are classified close together as they still have some
characteristics the same.…read more

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